minor fix

speciesData.py

@@ -105,7 +105,7 @@ class SpeciesData:
         self.abbreviation = "_".join(utilities.filter_empty_not_empty_items([self.genus_lowercase[0], self.species, self.strain, self.sex])["not_empty"])
 
         self.species_folder_name = "_".join(utilities.filter_empty_not_empty_items(
-            [self.genus_lowercase, self.species_lower(), self.strain.lower(),
+            [self.genus_lowercase, self.species_lower, self.strain.lower(),
              self.sex.lower()])["not_empty"])
 
         self.dataset_prefix = None