part of phosphatidylinositol-3,4-bisphosphate 4-phosphatase activity https://github.com/geneontology/go-ontology/issues/24252 https://github.com/geneontology/go-ontology/issues/30193 RHEA:17193 molecular_function inositol polyphosphate 4-phosphatase type II activity 1-phosphatidyl-1D-myo-inositol-3,4-bisphosphate 4-phosphohydrolase activity Catalysis of the reaction: 1-phosphatidyl-1D-myo-inositol 3,4-bisphosphate + H2O = 1-phosphatidyl-1D-myo-inositol 3-phosphate + phosphate. MetaCyc:3.1.3.66-RXN Reactome:R-HSA-1676164 Reactome:R-HSA-1676162 EC:3.1.3.66 GO:0004440 GO:0016316 phosphatidylinositol phosphate 4-phosphatase activity phosphatidylinositol-3-phosphate biosynthetic process phosphatidylinositol-3,4-bisphosphate phosphatase activity