Figure 4.

Interspecific polymorphism in eight putative cis-regulatory regions from 18 Lake Malawi cichlid species. A - H) Minor allele frequency (MAF; in red) and nucleotide diversity (π; in black) calculated in a sliding window across the proximal promoter regions of five opsins (A - E), CNE 7 (LWS-LCR) (F), and two opsin 3'-UTRs (G - H) using 18 Lake Malawi cichlid species. Numbers above peaks of MAF and π denote the position of SNPs analyzed for allelic-association with opsin expression (see Table 6); asterisks (*) denote polymorphisms that interrupt CRX binding sites.

O'Quin et al. BMC Evolutionary Biology 2011 11:120   doi:10.1186/1471-2148-11-120
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