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HIV VLP secretion by HEK293 cells infected/transfected with vaccine candidates as revealed by TEM: (A) post-transfection with dual plasmid DNA vaccine candidate. Magnification × 100,000; (B) post-infection with rFPV. Magnification × 100,000; (C) post-infection with rMVA. Magnification × 100,000. Uninfected HEK293 cells were screened by TEM for virus particles but no viruses were observed in any grids (data not shown). Bar = 120 nm.
