the initial high amounts of mono-l-alanyl-l-cystine and mono-glycyl-l-cystine as well as the prompt increase of the constituent free amino acids alanine , glycine and cystine strongly suggest that the peptide disappearance is mainly due to a very fast two-step hydrolysis in the extracellular compartment , presumably catalyzed by soluble and/or plasma membrane-bound peptidases .
C0002520
amino acids
C0017890
glycine