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(A) Experimental protocol for reversal of pulmonary hypertension showing timing of administration of MSC-EV or PBS vehicle. (B and C) RVSP (B) and RV/LV + S (C) were measured 3 weeks after removal from 3 weeks of hypoxia. *P < 0.05, **P < 0.01, ***P < 0.001, and ****P < 0.0001.
