The mutagenic and antimutagenic effects of channel modulating capsule(CMCA)were studied with micromucleus test in bone marrow cells of mice(in vivo) and in the lymphocytes of human blood(in vitro). The main results are as follows ①10-50μg/ml CMCA did not induce micronucleus formation in lymphocytes in vitro.10-50μg/ml CMCA inhibited induced micronucleus formation byγrays significantly.② No significant effect of 10-50mg/kg body weight(B.W.) on MNF in polychromatic erythrocytes(PCE) of mice was found. 10-50m...