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Growth kinetics of parental and chimeric viruses in chicken embryo fibroblast (DF1) cells. Multiple-cycle growth conditions were used to assess the differences in the growth of these viruses. DF1 cells were infected with virus at an MOI of 0.01. Supernatants collected at 8-h intervals were used for determining virus titers by a plaque assay. Data are means from three independent experiments.
