Fig. 4From: Chloroplast gene expression level is negatively correlated with evolutionary rates and selective pressure while positively with codon usage bias in Ophioglossum vulgatum LThe Pearson correlation coefficient analysis results among the TPM values, dN, dS and dN/dS (64 conserved genes). The numbers on the upper triangular are correlation values. * represents significant at the 0.05 levelBack to article page