PTGIS and pulmonary arterial hypertension: Tuder Tuder RM RM Cool Cool CD CD Geraci Geraci MW MW Wang Wang J J Abman Abman SH SH Wright Wright L L et al et al Prostacyclin Synthase Expression is Decreased in Lungs from Patients with Severe Pulmonary Hypertension Prostacyclin Synthase Expression is Decreased in Lungs from Patients with Severe Pulmonary Hypertension Am J Respir Crit Care Med Am J Respir Crit Care Med 1999 1999 159 159 6 6 1925 1925 1932 1932 10.1164/ajrccm.159.6.9804054.