diff --git a/ena_upload/_version.py b/ena_upload/_version.py
index 7225152..43a1e95 100644
--- a/ena_upload/_version.py
+++ b/ena_upload/_version.py
@@ -1 +1 @@
-__version__ = "0.5.2"
+__version__ = "0.5.3"
diff --git a/ena_upload/templates/ENA_template_samples_ERC000011.xml b/ena_upload/templates/ENA_template_samples_ERC000011.xml
index d6e113e..46cc304 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000011.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000011.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000012.xml b/ena_upload/templates/ENA_template_samples_ERC000012.xml
index 7e87f2c..b035335 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000012.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000012.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000013.xml b/ena_upload/templates/ENA_template_samples_ERC000013.xml
index d7b7f81..89ab78d 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000013.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000013.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000014.xml b/ena_upload/templates/ENA_template_samples_ERC000014.xml
index 9ddea06..a8a9f47 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000014.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000014.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000015.xml b/ena_upload/templates/ENA_template_samples_ERC000015.xml
index 2e94cce..527a756 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000015.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000015.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000016.xml b/ena_upload/templates/ENA_template_samples_ERC000016.xml
index 35e1720..9e3f1e7 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000016.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000016.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000017.xml b/ena_upload/templates/ENA_template_samples_ERC000017.xml
index 8d836ee..9309833 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000017.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000017.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000018.xml b/ena_upload/templates/ENA_template_samples_ERC000018.xml
index 5c1584a..c30042b 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000018.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000018.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000019.xml b/ena_upload/templates/ENA_template_samples_ERC000019.xml
index 370f4c1..8af01c6 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000019.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000019.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000020.xml b/ena_upload/templates/ENA_template_samples_ERC000020.xml
index 71ee6a3..d26699d 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000020.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000020.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000021.xml b/ena_upload/templates/ENA_template_samples_ERC000021.xml
index 99f199b..50ecca6 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000021.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000021.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000022.xml b/ena_upload/templates/ENA_template_samples_ERC000022.xml
index 2602c67..b129c40 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000022.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000022.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000023.xml b/ena_upload/templates/ENA_template_samples_ERC000023.xml
index 240f1b7..0e16a66 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000023.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000023.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000024.xml b/ena_upload/templates/ENA_template_samples_ERC000024.xml
index 7bb6f38..43c5750 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000024.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000024.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000025.xml b/ena_upload/templates/ENA_template_samples_ERC000025.xml
index 1df119d..d2a78d8 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000025.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000025.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000027.xml b/ena_upload/templates/ENA_template_samples_ERC000027.xml
index add3ee3..c24d787 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000027.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000027.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000028.xml b/ena_upload/templates/ENA_template_samples_ERC000028.xml
index 2a66025..3b8e283 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000028.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000028.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000029.xml b/ena_upload/templates/ENA_template_samples_ERC000029.xml
index 8d965e9..df249a6 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000029.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000029.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000030.xml b/ena_upload/templates/ENA_template_samples_ERC000030.xml
index 8e7fdcf..1c5bfad 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000030.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000030.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000031.xml b/ena_upload/templates/ENA_template_samples_ERC000031.xml
index cd6f37f..da0df22 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000031.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000031.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000032.xml b/ena_upload/templates/ENA_template_samples_ERC000032.xml
index 7d60497..3b9d32a 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000032.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000032.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000033.xml b/ena_upload/templates/ENA_template_samples_ERC000033.xml
index 857c1e2..46e57d8 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000033.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000033.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000034.xml b/ena_upload/templates/ENA_template_samples_ERC000034.xml
index 24a192e..311846f 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000034.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000034.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000035.xml b/ena_upload/templates/ENA_template_samples_ERC000035.xml
index 880c7cb..bca85be 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000035.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000035.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000036.xml b/ena_upload/templates/ENA_template_samples_ERC000036.xml
index 8e0e5c3..672de58 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000036.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000036.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000037.xml b/ena_upload/templates/ENA_template_samples_ERC000037.xml
index 0f64eca..12e0548 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000037.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000037.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000038.xml b/ena_upload/templates/ENA_template_samples_ERC000038.xml
index 1c5ce1f..4852515 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000038.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000038.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000039.xml b/ena_upload/templates/ENA_template_samples_ERC000039.xml
index 1d90030..93c057e 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000039.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000039.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000040.xml b/ena_upload/templates/ENA_template_samples_ERC000040.xml
index b544851..42f63ef 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000040.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000040.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000041.xml b/ena_upload/templates/ENA_template_samples_ERC000041.xml
index 13bcadd..b77db32 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000041.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000041.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000043.xml b/ena_upload/templates/ENA_template_samples_ERC000043.xml
index aadce2c..003e3c3 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000043.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000043.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000044.xml b/ena_upload/templates/ENA_template_samples_ERC000044.xml
index 2073c76..1b9dc04 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000044.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000044.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000045.xml b/ena_upload/templates/ENA_template_samples_ERC000045.xml
index df412c9..69bbc61 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000045.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000045.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000047.xml b/ena_upload/templates/ENA_template_samples_ERC000047.xml
index d9151ee..a974f1d 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000047.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000047.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000048.xml b/ena_upload/templates/ENA_template_samples_ERC000048.xml
index 9474c97..1e425ab 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000048.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000048.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000049.xml b/ena_upload/templates/ENA_template_samples_ERC000049.xml
index d9c2c9d..a63ff04 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000049.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000049.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000050.xml b/ena_upload/templates/ENA_template_samples_ERC000050.xml
index c313b9b..6bf6a1d 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000050.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000050.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000051.xml b/ena_upload/templates/ENA_template_samples_ERC000051.xml
index ca010ec..98f3247 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000051.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000051.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000052.xml b/ena_upload/templates/ENA_template_samples_ERC000052.xml
index 2e0b45e..366e9c5 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000052.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000052.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/ENA_template_samples_ERC000053.xml b/ena_upload/templates/ENA_template_samples_ERC000053.xml
index 1a340b2..34ef511 100644
--- a/ena_upload/templates/ENA_template_samples_ERC000053.xml
+++ b/ena_upload/templates/ENA_template_samples_ERC000053.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/ena_upload/templates/jinja_templates/ENA_template_samples.xml b/ena_upload/templates/jinja_templates/ENA_template_samples.xml
index ee0c634..8a27afa 100755
--- a/ena_upload/templates/jinja_templates/ENA_template_samples.xml
+++ b/ena_upload/templates/jinja_templates/ENA_template_samples.xml
@@ -2,7 +2,7 @@
 <?python
 import pandas as pd
 def attributetest(row, column):
-    if hasattr(row, column) and pd.notna(row[column]) and not row[column].isspace() and str(row[column]).lower() not in ['nan', 'na']:
+    if hasattr(row, column) and pd.notna(row[column]) and not str(row[column]).isspace() and str(row[column]).lower() not in ['nan', 'na']:
         return True 
     else:
         return False
diff --git a/example_tables/ENA_excel_example_ERC000033.xlsx b/example_tables/ENA_excel_example_ERC000033.xlsx
index d09537a..a24390e 100644
Binary files a/example_tables/ENA_excel_example_ERC000033.xlsx and b/example_tables/ENA_excel_example_ERC000033.xlsx differ