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Heat-inactivated Delta variant SEM micrographs of SARS-CoV-2. (A, B) Viral particle distribution on a carbon grid (scale bar = 200 nm); (C) inactivated viral particle with round and shiny crownlike edges of SARS-CoV-2 (scale bar = 20 nm); (D) histogram showing the corresponding size distribution of (A) and (B) micrographs (N = 61).
