FIG. 3.

Replication of viruses with the wild-type MLP (MLP-WT) or mutations in the CAAT box of the MLP. A549 cells in monolayer culture were infected at an MOI of 10 FFU per cell, and samples were taken at intervals postinfection (p.i.). Virus was titrated by fluorescent focus assay. Yields per infected cell were calculated and are plotted on a log₁₀ scale.