Benzo (α) pyrene (BP) is a carcinogenic compound that is supposed to be able to indusce chromosomal damage. The mutagenic effect of BP has been studied using MN test on poly chromatic erythrocyte (PCE) cells of albino mice femur bone marrow. Mice were injected with 0.1 ml of 03% (b/v) BP subcutaneously at the sholder, every day at the same time for ten days. After 120 days, treated and non tre…