Additional file 4.

No correlation between expression divergence and (A) Ka, (B) Ks, or (C) Ka/Ks (R2 ≅ 0.0002 and P > 0.50 for all correlations). Expression divergence is quantified by ln(1+R)/(1-R) where R is the Pearson correlation coefficient between each paralogous expression profile [69]. In (C) two outliers that have a Ka/Ks ratio over 1 are excluded. There also is not a significant correlation between the Ka/Ks ratio and ln(1+R)/(1-R) (data not shown). Ka/Ks ratios were calculated from complete or large fragments of expressed X. laevis paralogs; the average length of these sequences was 1119 bp.

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Chain et al. BMC Evolutionary Biology 2008 8:43   doi:10.1186/1471-2148-8-43