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. Author manuscript; available in PMC: 2013 Mar 1.
Published in final edited form as: Nat Struct Mol Biol. 2012 Aug 5;19(9):893–899. doi: 10.1038/nsmb.2351

Figure 4.

Figure 4

The gp120 trimer association domains. (a) The segmented local densities of gp120 that associate near the trimer axis are shown as solid surfaces wrapped in a meshwork representing the overall Env trimer, viewed from the perspective of the target cell. Note the central triangular junction (yellow) with a diameter of around 1.5 nm. (b) The gp120 trimer association domain segments are viewed from the perspective of the viral membrane. Three arms extend from the V3 base of each gp120 subunit toward the trimer axis and appear to support the central triangular junction. The approximate positions of the V1/V2 stem and V3 base are labelled in a and b. (c) The gp120 trimer association domain segments are viewed from a perspective parallel to the viral membrane.