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IC50 determination for the inhibition of CP I and III uptake by RIF in PXB‐cells. Intracellular CP I and III accumulation were determined after coincubation with 0.3 μmol/L CP I and III, and 0.02–200 μmol/L RIF for 5 min at 37°C. The RIF concentration causing half‐maximal inhibitory effect (IC50) on CP I and III accumulation in PXB‐cells was calculated. Each point is represented as mean (n = 2).
