Pip5k1b (Mmus) 68 kDa type I phosphatidylinositol 4-phosphate 5-kinase beta phosphatidylinositol 4-phosphate 5-kinase type I beta ptdIns(4)P-5-kinase 1 beta PIP5KIbeta PIP5KI-beta PIP5K1-beta STM7 Pipk5b phosphatidylinositol 4-phosphate 5-kinase type-1 beta PI4P5K-I[b] gene