Reaction catalyzed by Thermococcus onnurineus carboxypeptidase (3.4.17.B4), Pyrococcus furiosus carboxypeptidase (3.4.17.B5)

		+		H2O	=			+
	Ac-Asp-Arg-Val-Tyr-Ile-His-Pro-Phe-His	+		H2O	=		Ac-Asp-Arg-Val-Tyr-Ile-His-Pro-Phe	+		L-histidine