FIGURE 2.

Comparison of average diversity in Env indicates intermediate CTT variation relative to other domains. Tukey box and whisker plots (GraphPad Prism Version 5.0) of Env gp120, gp41 Ecto, and the CTT domain amino acid diversity are plotted for clades B and C and group O. Statistical significance of the differences between all populations (box and whisker plots) was performed using an unpaired two-tailed t test with Welch's corrections. The differences in all the medians are statistically significant.