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Growth kinetics of HCMV strains TB40-BAC4, vTB65g, vTB150g, and vTB28g. HFF were infected at an MOI of 5, culture supernatants were sampled at the indicated time points, and infectivity was determined subsequently on HFF. Day zero values represent the input infectivity. Each point and error bar represent the mean ± standard deviation for four independent experiments. p.i., postinfection.
