title: Proposal for numbering mutants of avian leukosis and sarcoma viruses.
abstract: A system for the numbering of mutants of avian sarcoma and leukosis viruses is proposed.
mesh_terms: D001355:Alpharetrovirus / Q000145:classification*; D001358:Avian Sarcoma Viruses / Q000145:classification; D009154:Mutation; D009626:Terminology as Topic