Reaction catalyzed by prolyl aminopeptidase (3.4.11.5), bacterial leucyl aminopeptidase (3.4.11.10), aminopeptidase Ey (3.4.11.20)

		+		H2O	=			+
	Pro-Phe-Gly-Lys	+		H2O	=		Pro	+		Phe-Gly-Lys