BMP4 and pulmonary hypertension, primary, 1: Figure 10(a) shows that the protein level of BMP4 was increased in PHT (50 mg/L) group than in the NC group.  Figure 10(b) shows that the protein level of Smad 1/5/9 was elevated in PHT (50 mg/L) group than in the NC group.  Figure 10(c) shows that the protein level of p-Smad 1/5 was significantly upregulated in PHT (50 mg/L) group than in the NC group.