Updated project metadata. BMP9 and BMP10 are two key regulators of vascular homeostasis. These two ligands bind with high affinity to the endothelial type I receptor ALK1 together with a type 2 receptor. Mutations in this signaling pathway have been identified in two rare cardiovascular diseases, hereditary hemorrhagic telangiectasia and pulmonary arterial hypertension. So far, only the canonical SMAD signaling pathway has been extensively studied in response to BMPs. The aim of this work was to address early phosphoproteomic changes in endothelial cells in response to short-term stimulation (30 mins) with BMP9 and BMP10 in order to identify new phosphorylated targets and signaling pathways.