TY - JOUR AU - Ali, M S; Ibrahim, S A; Jalil, S; Choudhary, M I TI - Ursolic acid: a potent inhibitor of superoxides produced in the cellular system JO - Phytother Res VL - 21 PY - 2007 DO - 10.1002/ptr.2108 SP - 558 EP - 561 ER -