Additional file 5.

Evolutionary parameters of the Tra2 proteins from insects. Average numbers of amino acid (pAA), total nucleotide (pNT), synonymous (pS) and non-synonymous (pN) nucleotide differences per site, codon bias (Effective Number of Codons, ENC) and Z-test of selection in complete tra-2 genes and independent tra-2 domains from insects. SE, standard error; R, average transition/transversion ratio; n/a, not applicable. a H0: pN = pS; H1: pN < pS.

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Sarno et al. BMC Evolutionary Biology 2010 10:140   doi:10.1186/1471-2148-10-140