Fig. 3From: Contrasting genetic variation and positive selection followed the divergence of NBS-encoding genes in Asian and European pearsDistribution of Ks values of NBS genes pairs. Orange lines at the x-axis and the gray dotted box represented the Ks value region from 0.15 to 0.30. a Distribution of Ks values in P. bretschneideri and P. communis, respectively (b) Distribution of Ks values of Orthologous gene pairs between two pear species. Letter ‘Pb’ means P. bretschneideri, and letter ‘Pc’ means P. communis. Ks represents synonymous substitutions per siteBack to article page