Ka/Ks distribution among 6053 homolog pairs of Pinus tabuliformis and P. taeda. The mean Ka/Ks value was 0.63. The solid line shows the threshold of Ka/Ks = 1, whereas the dashed line marks the more conservative threshold of Ka/Ks = 2. Overall 938 orthologous sequences fell above the light solid line and 207 sequences fell above the dashed line.
Niu et al. BMC Genomics 2013 14:263 doi:10.1186/1471-2164-14-263