PAML results.

1for sequence fragments, the numbers correspond with the position of first and last nucleotides in the alignment with excluded gaps.2n, the number of sequences in the alignment and tree.3c, the number of codons.4parameters determined under M2a with ω the ratio of non-synonymous rates (dN) and synonymous rates (dS) and p the corresponding proportion of sites for each ω-class.5parameters determined under M8 with ω the ratio dN/dS, the corresponding proportion (p1 = 1−p0) of sites and p- and q-estimates in the β(p,q)-distribution.