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mRNA expression of As+3 exporters in D1 cells treated with 500 nM As+3. D1 cells were treated 500 nM As+3, expression of Mrp1, Mrp2, Mdr1a, and Mdr1b at 2, 4, and 18 h was examined by RT-PCR. A, Mrp1. B, Mrp2. C, Mdr1a. D, Mdr1b. *Significantly different compared with control (P < .05). Results are means ± SD.
