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(A) MRP4 localization assessed by immunohistochemistry in human pulmonary arteries from control and PAH patients. Arrows indicate the localization of MRP4 proteins found in endothelial cells, SMCs, and pneumocytes. (B) Western blot analysis of MRP4 in lung homogenates from patients showing controls (n = 4) and PAH (n = 4) patients. (C) Quantitative analysis of the results (*P < 0.05). Scale bar: 100 μm.
