https://pubmed.ncbi.nlm.nih.gov/3923365/
Direct mutagenesis of Ha-ras-1 oncogenes by N-nitroso-N-methylurea during initiation of mammary...
Induction of mammary carcinomas in rats by a single exposure to a carcinogen during sexual development often involves malignant activation of the Ha-ras-1...
https://www.semanticscholar.org/topic/methylurea/380378
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