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Effects of P‐glycoprotein (P‐gp) substrates, the P‐gp non‐substrate and inhibition of P‐gp function on Matrigel invasion of MCF‐7 and MCF‐7/Adr cells. Matrigel invasion was evaluated using trans‐well chambers. Bar graphs represent mean ± SEM of three independent experiments. *P < 0.05 versus vehicle group.
