PLA2 catalyzes the calcium-dependent hydrolysis of the 2-acyl groups in 3-sn-phosphoglycerides. Cytotoxic in Ehrlich ascites carcinoma model in mice and towards human cancer cell line U937 (IC(50)=610 ug/ml). a 1,2-diacyl-sn-glycero-3-phosphocholine + H2O = a 1-acyl-sn-glycero-3-phosphocholine + a fatty acid + H(+) Binds 1 Ca(2+) ion. Expressed by the venom gland. Is not lethal to mice up to 4.7 mg/kg by intraperitoneal injection. Belongs to the phospholipase A2 family. Group I subfamily.