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Fig. 7. Wild-type, Y121D and P127L virus particles display distinct cellular localizations and morphologies. (A) Electron micrographs of 293T cells transfected with the wild-type XMT provirus. Arrows point to electron dense thickenings underneath the plasma membrane. Scale bars represent 100 nm. (B) Electron micrographs of 293T cells transfected with the Y121D-mutated provirus. Arrows point to electron dense thickenings underneath the plasma membrane. Scale bars represent 50 nm. (C) Electron micrographs of 293T cells transfected with the P127L-mutated provirus. Arrows point to particles still tethered to cellular membrane. Bars, 100 nm.