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Erythropoietin (EPO) from pulmonary arterial hypertension (PAH) serum promotes pulmonary artery endothelial cell (EC) networking in vitro. A, Pulmonary artery EC in 10% idiopathic PAH (IPAH) serum (top), with control immunoglobulin G (IgG; middle), or with 200 uL EPO-neutralizing antibody (antiEPO; bottom). B, Cell coverage area; a single asterisk indicates P < 0.05; a double asterisk indicates P > 0.05.
