analysis of the nh2-terminal amino acid residues from the resultant gelatin peptides showed sequences of `` '' -h2n-ile-y-gly '' '' and `` '' h2n-leu-y-gly '' '' only ( where y indicates that any amino acid can be found in that position ) , indicating that gly-ile and gly-leu bonds are the only sites of collagenase cleavage in this substrate .
C0002520
any amino
C0017890
hat