Definition: Term formerly used to describe a subfamily of nononcogenic viruses (family Retroviridae) that includes the slow viruses of sheep (visna virus and maedi virus) and human T-cell lymphotropic viruses, including human immunodeficiency viruses types 1 and 2. The viruses resemble the C-type RNA tumor viruses (Oncovirinae) in many ways, including production of reverse transcriptase.
[L. lentus, sluggish, slow]
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