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pubmed:abstractText |
After the DNA of newborn female rats had been labelled by repeated injections of [14C]orotate (totalling 36 mu Ci) during the first 3 weeks of life, approximately 1,000,000 dpm were found in the DNA of the liver, lungs, kidneys, gut, brain, heart and spleen of 8-week-old rats. Methyl methanesulphonate (MMS) (80 mg/kg) and di-(2-chloroethyl)methylamine (HN2) (5 mg/kg) injection increased the amount of 14C-labelled DNA pyrimidine nucleosides excreted in the urine to 5000 dpm from 350 dpm before injection. The effect on RNA products was much less marked.
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