DNA strand-specific mutations induced by (+/-)-3 alpha,4 beta-dihydroxy- 1 alpha,2 alpha-epoxy-1,2,3,4-tetrahydrobenzo[c]phenanthrene in the dihydrofolate reductase gene

DNA strand-specific mutations induced by (+/-)-3 alpha,4 beta-dihydroxy- 1 alpha,2 alpha-epoxy-1,2,3,4-tetrahydrobenzo[c]phenanthrene in the dihydrofolate reductase gene