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Plaque morphologies and growth kinetics of wild-type (WT) and in vitro-generated (ΔTV) TV. (A) WT TV (a) and ΔTV (b) exhibit similar plaque morphologies. (B) Growth curves of WT and ΔTV viruses. LLC-MK2 cells were infected with WT or ΔTV at a multiplicity of infection of 0.025.
