title: Extracts of xeroderma pigmentosum group A fibroblasts introduce less nicks into methyl methanesulfonate-treated DNA than extracts of normal fibroblasts.
mesh_terms: D002478:Cells, Cultured; D004278:DNA, Superhelical; D004720:Endonucleases / Q000378:metabolism*; D005347:Fibroblasts; D006801:Humans; D008698:Mesylates / Q000494:pharmacology*; D014983:Xeroderma Pigmentosum
chemical_list: D004278:DNA, Superhelical; D008698:Mesylates; D004720:Endonucleases