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Schematic depiction of canonical domain structures for vertebrate endogenous retroviruses (a), LTR retrotransposons (b), zebrafish bhikhari (c), and EZR1 (d). Arrows indicate protein coding regions. LTR, long terminal repeat; ORF, open reading frame; PBS, primer binding site; PPT, poly-purine tract; TSR, target site repeat (duplication); and env, envelope protein gene; gag, group antigen gene; int, integrase gene; pol, poly-protein gene.
