1-phosphatidylinositol-4,5-bisphosphate phosphodiesterase beta 4 (EC 3.1.4.11) (Phosphoinositide phospholipase C) (Phospholipase C- beta-4) (PLC-beta-4); The production of the second messenger molecules diacylglycerol (DAG) and inositol 1,4,5-trisphosphate (IP3) is mediated by activated phosphatidylinositol-specific phospholipase C enzymes. This form has a role in retina signal transduction (1194 aa)