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Effects of PFE on viability in RAW 264.7 cells. Cells studied in 96-well plates (2×104 cells/well) were first incubated with and without indicated concentrations of PFE for 20 hr. Each value is expressed as mean±SD in triplicate experiments. PFE: Perilla frutescens (L.) Britton var. frutescens extracts.
