RNA reverse-transcribing viruses

an enzyme which generates DNA from an RNA template, a process termed reverse transcription

thumb|Reconstruction of Saccharomyces cerevisiae Ty1 (genus Pseudovirus) virion with its building blocks. Pseudoviridae is a family of viruses, which includes three genera.

Metaviridae is a family of viruses which exist as Ty3-gypsy LTR retrotransposons in a eukaryotic host's genome. They are closely related to retroviruses: members of the family Metaviridae share many genomic elements with retroviruses, including length, organization, and genes themselves. This includes genes that encode reverse transcriptase, integrase, and capsid proteins. The reverse transcriptase and integrase proteins are needed for the retrotransposon activity of the virus. In some cases, virus-like particles can be formed from capsid proteins. Some assembled virus-like particles of member