Characterized retrotransposons from three yeast species. Schematic representations of the indicated retrotransposon families drawn to scale. Boxed arrowheads indicate LTRs. Domains of proteins: EN- endonuclease, IN- integrase, PR- protease, RT- reverse transcriptase, RT-RH- reverse transcriptase-RNase H, ZF- zinc finger. pA- poly(A) sequence. The gag ORF of Ty1-Ty4 is raised relative to pol to indicate a + 1 translational frameshift between gag and pol. A vertical line with “stop” indicates the site of one or more stop codons.