"Blockade of MER proto-oncogene tyrosine kinase (MerTK) results in accumulation of apoptotic cells within tumors and triggers type I interferon response. Treatment of tumor-bearing mice with anti-MerTK antibody stimulates T cell activation and synergizes with anti-PD-1 or anti-PD-L1 therapy. Abolishing cGAMP production depleting extracellular ATP or inactivating ATP-gated P2X7R channel compromises anti-MerTK blockade."xsd:string