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Transmission electron micrographs reveal the various stages of apparent endocytosis of the NBISA01 virus in Atlantic salmon erythrocytes. (A) a virus particle within an invagination of the plasma membrane (bar = 139 nm); (B) partial closure of the pit containing a virus particle (bar = 139 nm); (C) and (D) virus particle with in a vesicle in the erythrocyte cytoplasm (bar = 139 nm).
