Median proportion variant at sites shared or unique to the SIV from each host.

1The proportions of shared and unique synonymous SNPs did not differ significantly among hosts; χ2 = 2.32; 3 d.f.; N.S.2The proportions of shared and unique nonsynonymous SNPs differed significantly among hosts; χ2 = 15.71; 3 d.f.; P = 0.001.**Mann-Whitney test of the hypothesis that the median proportion variant of shared SNPs equaled that of unique SNPs: P***Mann-Whitney test of the hypothesis that the median proportion variant of shared SNPs equaled that of unique SNPs: P