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Growth of recombinant viruses in murine 17 Cl 1 cells. (A) Expression of viral nucleocapsid protein (N) of MHV-A59, MHV/BHK, or the recombinant viruses was detected at 8 h p.i. with anti-N MAb. Magnification ×400. (B) Yields of viruses released into tissue culture supernatants. Average virus yields ± SEM of two independent experiments are shown.
