PROS1 and neoplasm: Co-culture of DCs with NDV-infected tumor cells dramatically increased the expression of Axl, a phagocytic receptor that binds apoptotic cell phosphatidylserine through GAS6 and PROS1 proteins31, and Clec9A, a C-type lectin that binds dead cell debris through exposed F-actin-myosin complexes and facilitates cross-presentation of dead-cell Ag32 (Fig. 2d).