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Figure 6 Ratio of medial wall thickness to the external diameter of the pulmonary arteries of rats in the Control group (n = 12), PH group (n = 17), PH + TA group (n = 18), PH + BPS group (n = 13) and PH + TA + BPS group (n = 18). Pulmonary arteries with an external size of about 50 µm were chosen. *p < 0.05 vs. Control group. p < 0.05 vs. PH group. ^#p < 0.05 vs. PH + TA + BPS group. Each column and bar represents the mean value ± SE. BPS = beraprost sodium; PH = pulmonary hypertension; TA = TA-0201.