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. 2007 May 16;81(15):7885–7893. doi: 10.1128/JVI.00218-07

FIG. 4.

FIG. 4.

Net V3 charge of env clones. R5-tropic clones are indicated by open circles (median net V3 charge +3), dual-R clones are indicated by open triangles (median +4), dual-X clones are indicated by filled triangles (median +6), and X4-tropic clones are indicated by crosses (median +5).