title: Chemical method for identification of N-blocked group in pyroglutamic acid peptides.
mesh_terms: D000595:Amino Acid Sequence; D009842:Oligopeptides / Q000032:analysis; D011760:Pyrrolidinones / Q000032:analysis*; D011761:Pyrrolidonecarboxylic Acid / Q000032:analysis*
chemical_list: D009842:Oligopeptides; D011760:Pyrrolidinones; D011761:Pyrrolidonecarboxylic Acid