FIG. 1.

Ribbon diagrams of three HIV gp120 V3 loops complexed with different anti-V3 mAbs, as viewed from the front (top) and side (bottom). Thus, V3 loops are shown in the context of (a) mAb 2219, (b) mAb 447-52D, and (c) mAb F425-B4e8. Loops a and b are from HIV-1 strain MN, whereas c is from strain RP142. Each 3D structure is colored from N-terminal to C-terminal in a blue to red gradient.