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Figure 1.
Fig. 1. Structure of an HIV-1 gp120 core with V3. The crystal
structure of core gp120 (gray) with an intact V3 (red) is shown
bound to the membrane-distal two domains of the CD4 receptor
(yellow) and the Fab portion of the X5 antibody (dark and light
blue). In this orientation, the viral membrane would be
positioned toward the top of the page and the target cell toward
the bottom.
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