Additional file 4.No correlation between expression divergence and (A) Ka, (B) Ks, or (C) Ka/Ks (R^{2 }≅ 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. Format: PDF Size: 1.8MB Download file This file can be viewed with: Adobe Acrobat Reader Chain et al. BMC Evolutionary Biology 2008 8:43 doi:10.1186/1471-2148-8-43 |