a 1,2-diacyl-sn-glycero-3-phospho-(1D-myo-inositol-3,4-bisphosphate) + H2O <=> a 1,2-diacyl-sn-glycero-3-phospho-(1D-myo-inositol-3-phosphate) + phosphate
a 1,2-diacyl-sn-glycero-3-phospho-(1d-myo-inositol-3,4-bisphosphate) + h2o <=> a 1,2-diacyl-sn-glycero-3-phospho-(1d-myo-inositol-3-phosphate) + phosphate