PLA2G2A and gas gangrene: In this work, we examined the ability of two fractions of an S. macrophylla leaf extract and of catechin (an abundant component in these fractions) to attenuate the myonecrosis caused by a PLA2 from Colombian B. asper venom in mouse gastrocnemius muscle and to prevent the neuromuscular action of Brazilian B. marmoratus venom in mouse isolated phrenic nerve-diaphragm preparations.