Diversity and model analysis of full length <i>env</i> sequences from 28 acutely infected subjects.

aHD, Hamming Distance - number of base positions at which two sequences differ. bMRCA - most recent common ancestor (95% confidence interval). cLamda - mean of the best fitting Poisson found through maximum likelihood method. dGoodness of fit P value - χ2 goodness-of-fit test statistic for λ, where p<0.05 suggests that the observed distribution of mutations is inconsistent with a Poisson. eStar phylogeny - random virus evolution. fRecombinants in gp160 env. gInitial sequence set used for statistical comparisons. hTotal number of sequences analyzed. ind - not done. jRecombinants in gp160 were 30 out of 72 sequences but in the 3′ half genome were 63 out of 72 sequences.