Expression levels of BMPR2 isoforms in patients with IPF. Expression levels of BMPR2 isoform A (A), BMPR2 isoform B (B), or calculated ratio of isoform A relative to isoform B (B/A ratio; C), from lung samples from normal controls, IPF, or IPF+PH patients. *P ≤ 0.05, ANOVA comparisons between normal and IPF or IPF+PH groups. Linear regression and Pearson's correlation for BMPR2 isoform A (D), BMPR2 isoform B (E), or calculated ratio of isoform A relative to isoform B (F) against mean pulmonary arterial pressure (mPAP) from patients with IPF and IPF+PH. Expression levels of BMPR2 isoform A (G), BMPR2 isoform B (H), or calculated ratio of isoform A relative to isoform B (I), from cultured lymphocytes from normal controls or IPF patients. *P ≤ 0.05, **0.001 < P < 0.01, t-test comparisons between controls and IPF groups.