
Keywords: 5-HT (5-hydroxytryptamine); serotonin; TPH1; tryptophan hydroxylase 1; 5HTR; 5-HT receptor; 5HTT; 5-HT transporter; PDGF; platelet derived growth factor; PDGFR; platelet derived growth factor receptor; SMA; smooth muscle actinECs pulmonary arterial endoth