activities of aminopeptidases were found directed against compounds of l-alanine , l-arginine , l-aspartic acid , glycine , l-isoleucine , l-leucine , l-lysine , l-methionine , l-phenylalanine , l-proline , l-tryptophane , and l-tyrosine , but not against compounds of l-cystine , l-glutaminic acid , l-histidine , l-hydroxyproline , and l-valine ( table 1 ) .
C0033382
l-proline
C0020388
l-hydroxyproline