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Ka/Ks of RR-1 and RR-2 single-copy genes. Ka/Ks is plotted as a function of Ks for all An. gambiae paralog pairs and all An. gambiae – Ae. aegypti ortholog pairs for which the estimated Ks < 2. Genes in sequence clusters are excluded because they are likely to be products of recent duplication or gene conversion, which can bias Ka/Ks.
