BACKGROUND AND AIM:To study the protective effects of ursolic acid extract from Ledum Pulastre L.against genetic damage.MATERIALS AND METHODS:We used mice with genetic damage caused by cyclophosphamide,(CP),as a model of injury.Through mouse cells of bone marrow PCE micronuclear test,the protective effects of ursolic acid extract on genetic damage was measured.RESULTS:The bone marrow cells-nuclear PCE rates of ursolic acid extract at 1.16,2.30,4.60 g/kg dose were 2.20‰ ±0.37‰,2.00‰ ±0.45‰,1.80‰±0.37‰,respec...