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Growth properties of CCHH mutant viruses. MDCK, MLE 12, 3LL, A549, and 293T cells were infected with each virus at an MOI of 0.001. At the indicated time points, virus titers (PFU) in the supernatant were determined. The values are the means of results from triple experiments. The standard deviation is less than 0.5 for each sample.
