FIG 4.

Representative electron micrographs of thin sections of QT6 cells transfected at 37°C with WT or mutant proviral plasmids. (A to I) Examples of particles with typical morphology are marked with open triangles. Black arrows mark areas of density that may represent Gag accumulation at membranes. Black boxes surround viral particles with heterogeneous features (e.g., large particles or ones with fragmented, multiple, or eccentric nuclei). Bars 500 nm. (J) Size distribution of viral particle diameters measured from electron micrographs using ImageJ software.