Betaretrovirus

Definition 1

A genus of single-stranded, reverse-transcribing RNA retroviruses with type B or type C morphology. It is the genus to which the mouse mammary tumor virus (MMTV) belongs. (NCI Thesaurus)

Definition 2

A genus of the family RETROVIRIDAE consisting of oncogenic exogenous retroviruses that contain type D particles. They include the type species, MASON-PFIZER MONKEY VIRUS, isolated from mammary carcinoma and normal tissues in rhesus monkeys, and several other serotypes of simian type D retroviruses (RETROVIRUSES TYPE D, SIMIAN), all of which cause simian AIDS (SAIDS) and other malignancies. The permanent human fibroblast virus (PMFV) is also type D. The core of the type D viruses is the intracytoplasmic type A particle and its mechanism of budding from the cell membrane is similar to the type B oncoviruses. (NLM, Medical Subject Headings)

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