non_LTR_retrotransposon YR_retrotransposon Tyrosine Kinase (YR) retrotransposons are a subclass of non-LTR retrotransposons. These YR-encoding elements consist of central gag, pol and tyrosine recombinase (YR) open reading frames (ORFs) flanked with terminal repeat. The pol ORF includes a reverse transcriptase (RT), a RNase H (RH) and, in case of DIRS, a domain similar to bacterial and phage DNA N-6-adenine-methyltransferase (MT). Compared to the retroviral pol (LTR retrotransposons, non-LTR retrotransposons and Penelope elements), both aspartic protease and DDE integrase are absent from YR retrotransposons. YR retrotransposons have inverted terminal repeats (ITRs). YR retrotransposon Added as per GitHub Issue Request #488 (https://github.com/The-Sequence-Ontology/SO-Ontologies/issues/488) tyrosine kinase retrotransposon 2020-06-25T14:00:30Z sequence SO:0002286 david