Figure 5From: The evolutionary rate variation among genes of HOG-signaling pathway in yeast genomesCorrelation between the d N / d S value and the position during the HOG signal transduction process from Sln1 (Sho1) to Hog1. The position of the HOG pathway genes was as shown in Figure 1. The downstream elements have higher levels of selective constraint than the upstream elements (Spearman's rank correlation coefficient: ρ = -0.313, P = 0.0189).Back to article page