Diversity and model analysis of full length env 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 peStar 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.