Positive selection on single codon level based on PAML (see text for details).

aGNBP alignment was 171 aa long and included eight species; SP14D1alignment was 246 aa long and included six species; Gambicin alignment was 81 aa long and included nine species; Defensin alignment was 101 aa long and included seven species (see Materials and Methods for the species listing for each gene).
bLikelihood ratio tests (with 2 df) were used to determine the significance of finding ω>1 over all codons by comparing selection models (M2 and M8) that allowed for ω>1 with neutral (M1 and M7) models that allowed only ω≤1.
cEstimate of the highest ω value for any codon.
dThe proportion of codons with the highest w estimate.
ePositions of the amino acids with ω>1 and their significant value estimated by BEB test in PAML.