title: The protovirus hypothesis: speculations on the significance of RNA-directed DNA synthesis for normal development and for carcinogenesis.
mesh_terms: D002471:Cell Transformation, Neoplastic / Q000209:etiology* / Q000235:genetics / Q000378:metabolism; D004247:DNA / Q000096:biosynthesis*; D004254:DNA Nucleotidyltransferases / Q000032:analysis; D005815:Genetic Code; D006801:Humans; D008954:Models, Biological; D009154:Mutation; D012367:RNA, Viral / Q000378:metabolism*
chemical_list: D012367:RNA, Viral; D004247:DNA; D004254:DNA Nucleotidyltransferases