Objective:To observe the preventive effect of Herba leonuri on genetic damage induced by CdSO 4 in the bone marrow cells of mice. Methods:The micronucleus test (MNT) of mouse bone marrow cells was used in the study. Results:CdSO 4could induce micronucleus formation in the bone marrow cells of mice and Herba leonuri could decrease strikingly micronuclei frequencies induced by CdSO 4. Conclusion:Herba leonuri may protect the genetic materials from injury caused by CdSO 4,namely, showing effective...