Replacement of lysine by arginine, phenylalanine, and tryptophan in the reactive site of the trypsin-kallikrein inhibitor (Kunitz).
D000595:Amino Acid Sequence; D007611:Aprotinin; D001120:Arginine; D001665:Binding Sites; D055598:Chemical Phenomena; D002621:Chemistry; D004589:Electrophoresis, Disc; D008239:Lysine; D010649:Phenylalanine; D014364:Tryptophan
D010649:Phenylalanine; D014364:Tryptophan; D007611:Aprotinin; D001120:Arginine; D008239:Lysine