Reaction catalyzed by phosphatidylinositol-3-phosphatase (3.1.3.64), phosphatidylinositol-3,4,5-trisphosphate 3-phosphatase (3.1.3.67)

		+		H2O	=			+
	phosphatidylinositol 3,4-bisphosphate	+		H2O	=		phosphatidylinositol 4-phosphate	+		phosphate