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Delta proteins function as cell surface ligands for Notch receptors in a highly conserved signal transduction mechanism. Delta activates Notch by “trans-endocytosis”, whereby endocytosis of Delta that is in complex with Notch on a neighboring cell induces activating cleavages in Notch. Alternatively, proteolysis of Delta renders the ligand inactive by dissociating the extracellular and cytosolic domains...