LTR_retrotransposon Endogenous_Retrovirus_LTR_retrotransposon 2020-06-25T14:00:30Z SO:0002268 david HERV Endogenous Retrovirus LTR retrotransposon Added as per GitHub Issue Request #488 (https://github.com/The-Sequence-Ontology/SO-Ontologies/issues/488) RLE retrotransposon sequence Endogenous retrovirus (ERV) retrotransposons are abundant in the genomes of jawed vertebrates. Human ERVs (HERVs) are classified based on their homologies to animal retroviruses. Class I families are similar in sequence to mammalian Gammaretroviruses (type C) and Epsilonretroviruses (Type E). Class II families show homology to mammalian Betaretroviruses (Type B) and Deltaretroviruses (Type D). F-Class III families are similar to foamy viruses.