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Figure 5 Photomicrographs of the pulmonary arteries in the Control group (A), PH group (B) and PH + TA + BPS group (C). Histologic examination of the lung showed a marked increase in pulmonary arterial medial wall thickening in the PH group. The increase in the thickening was attenuated in the PH + TA + BPS group. Each section was stained with Azan (x520). BPS = beraprost sodium; PH = pulmonary hypertension; TA = TA-0201.