Von Willebrand Factor (VWF) plays a pivotal role in blood coagulation, with its secretion from Weibel-Palade bodies (WPBs) being essential for responding to vascular trauma. Dysfunctional WPB biogenesis and exocytosis are characteristic of bleeding disorders such as Von Willebrand disease. In this project, we aim to identify the organelle trafficking routes responsible for WPB formation and secretion.