An . in vivo micronucleus assay using mouse bone marrow for identifying radioprotective effect of cimetidine is described. The influence of cimetidine, an antagonist to histamine H2 receptor, on the kinetics of low and high LET radiations such as gamma rays and neutron induced micronuclei as well as the clastogenic effects of chemicals such as benzene, ara C and mitomycin C was tested in Swiss ...