title: Origin of the enzymatically active A1 fragment of cholera toxin.
mesh_terms: D002772:Cholera Toxin / Q000032:analysis*; D004591:Electrophoresis, Polyacrylamide Gel; D008970:Molecular Weight; D010446:Peptide Fragments / Q000032:analysis*; D010455:Peptides / Q000032:analysis
chemical_list: D010446:Peptide Fragments; D010455:Peptides; D002772:Cholera Toxin