Figure 4.

The correlation of editing frequency and T-A distance at the 2^nd and 1^st codon positions in chloroplast genomes of A. formosae (a) and A. capillus-veneris (b, c). Membrane-bound protein coding genes are indicated by red dots, while soluble protein coding genes are presented as blue triangles. Regression results are significant for all presented analyses (p < 0.01) with details shown in each figure. Values in brackets indicate data points not included in the analyses due to excessive deviation from the mean (> 3 standard deviations). For clarity, the data of Figure 4c were re-analyzed using only the 19 genes containing reverse editing. However, the significant result obtained using all genes are presented in Additional file 1.