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Duck embryonic fibroblasts infected with 7 (white hashed bars) or 64 (grey bars) ffu PaBV-4, incubated with 0.05 μg/mL baicalein, 5.0 μg/mL ribavirin, both drugs or neither. Cells were analyzed by qRT-PCR with results (mean ±SD) shown as the fold change in P gene mRNA expression relative to the expression of the groups treated with neither drug.
