FIG. 5.
Electron micrographs of virions derived from HIV-1 wild-type or mutant vectors. Virions were derived from pON-T0 (WT), pT0PR− (PR−), pT0PTAP− (PTAP−), or pT0PTAP− (PTAP−/PR−). Scale bars represent 100 nm (all panels).
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