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Sequon density in gp120. The N and C terminal regions of gp120 have very different sequon densities. (A) The increase in NXT density over time in the N terminal region is significant (t = 2.88, p < 0.05). (B) The C terminal region has very high NXT density which is significantly decreasing (t = -4.08) over time, but NXS is increasing (t = 3.81). Comparable patterns are observed (C and D) when gp120 of HIV-1 subtype B is considered alone.
