inpp4b編碼肌醇聚磷酸4-磷酸酶Ⅱ型，它是磷脂酰肌醇信號傳導途徑中的一種酶。這種酶從3，4-二磷酸肌醇中除去肌醇環4位的磷酸基團。有有限的數據表明，人類II型酶受到選擇性剪接的影響，正如已經為I型酶建立的那樣。[由RefSeq提供，2008年7月]
INPP4B encodes the inositol polyphosphate 4-phosphatase type II, one of the enzymes involved in phosphatidylinositol signaling pathways. This enzyme removes the phosphate group at position 4 of the inositol ring from inositol 3,4-bisphosphate. There is limited data to suggest that the human type II enzyme is subject to alternative splicing, as has been established for the type I enzyme. [provided by RefSeq, Jul 2008]