FIG. 3.
Electron micrographs of virions derived from MLV wild-type or mutant gag-pol expression constructs. Virions were derived from pLGPS (WT), pMLVPR− (PR−), pMLVCAΔ12 (Δ12), and pMLVCAΔ12/PR− (Δ12/PR−). Scale bars represent 100 nm (all panels).
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