A subset of the detected groups for the SRK data set. Sequence of the SRK60 allele. Background colors indicate substitution rates as estimated by the Bayesian method , from blue (slow) to red (fast). Yellow boxes depict the hyper-variable regions, as defined by . Black boxes underline positions reported to be under positive selection by . Black lines show some of the most significant coevolving groups (see table 3) for detailed results.