Abstract
The human carcinogen and mouse germ cell mutagen chlorambucil is reported here to give a strong positive response in the mouse bone marrow micronucleus assay (4 mg/kg; single intraperitoneal injection). An increased incidence of micronucleated bone marrow white cells was also observed. It is concluded that chlorambucil is a broad spectrum mutagen that possesses subtle and specific mutagenic activities in some assay systems.

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