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Androgen receptor (AR) protein expression level in paired prostate cancer (PCa) tissues and surrounding normal prostate tissues. Levels of AR protein in paired samples of PCa tissues before treatment (N = 10 for stage I, N = 12 for stage II and III, and N = 15 for stage IV) and nearby non‐malignant prostate tissues were determined by immunohistochemical (IHC) staining. Original magnification of IHC staining is 200×. Red scale bar in the figure represents 50 μm
