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Origin and distribution of the class II PR-RT frameshift mechanism and the G-patch motif. Taxa in boldface do not contain encode the frameshift, whereas the other taxa do (gray type indicates taxa with deletions encompassing the frameshift site). The boxes by each taxon label indicate whether the virus encodes a G-patch domain and whether this domain is degenerate. All avian taxa encode a frameshift site but lack a G-patch domain (not shown).
