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Effect of knockdown of IL-21R on BPH-1 cell proliferation. Viability of BPH-1 cells treated with siIL-21R1 and sicon from day 0 until day 4 was analyzed by MTT assays. MTT assays was performed at the absorbance at 490 nm. The X axis indicates times, the Y axis indicates the absorbance of BPH-1 cells at 490 nm. Bars, ± SD; **P < 0.01 vs. sicon.
