the basic amino acids l-arginine and l-lysine , sites of tryptic cleavage , caused the release of trypsinogen , but not chymotrypsinogen , whereas the aromatic amino acids l-phenylalanine and l-tryptophan , sites of chymotryptic cleavage , caused release of both trypsinogen and chymotrypsinogen .
C0301713
aromatic amino acids
C0041249
l-tryptophan