title: Evidence for pyrrolidone carboxylic acid in beta-galactosidase from E.
mesh_terms: D000596:Amino Acids / Q000032:analysis; D002852:Chromatography, Ion Exchange; D004926:Escherichia coli / Q000032:analysis*; D005696:Galactosidases / Q000032:analysis*; D008970:Molecular Weight; D009578:Nitrobenzenes; D010447:Peptide Hydrolases; D010455:Peptides / Q000032:analysis; D011760:Pyrrolidinones / Q000032:analysis*; D013912:Threonine / Q000032:analysis
chemical_list: D000596:Amino Acids; D009578:Nitrobenzenes; D010455:Peptides; D011760:Pyrrolidinones; D013912:Threonine; D005696:Galactosidases; D010447:Peptide Hydrolases