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Electron micrographs of Vero cells infected with the CL49 (A and B), Y49Α (C), S50A (D), or R51A (E) viruses. Confluent cell monolayers were infected at an MOI of 5, incubated at 37°C for 24 h, and prepared for TEM. Nuclear (n), cytoplasmic (c), and extracellular (e) spaces are marked.
