Global dS and ω values across the OBP genes under the M3 (K = 2) model. The analysis was conducted using information of only the six species of the melanogaster group of Drosophila. dS, synonymous substitution rate; OBP, odorant-binding protein; ω, nonsynonymous substitution rate/dS.
Vieira et al. Genome Biology 2007 8:R235 doi:10.1186/gb-2007-8-11-r235