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a) Plasma stem cell factor (SCF) increased after initiating pulmonary arterial hypertension (PAH)-specific therapy; between baseline and follow-up, changes in SCF (ΔSCF) correlated with changes in b) pulmonary vascular resistance (ΔPVR) and c) 6-min walking distance (Δ6MWD). *: p<0.05 comparing PAH at baseline versus follow-up.
