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. 2021 Aug 2;9:686303. doi: 10.3389/fchem.2021.686303

FIGURE 7.

FIGURE 7

Immune Checkpoint Inhibition. Blocking of PD-1/PD-L1 or CTLA-4 with antibodies permits T cell activation. CTLA-4, cytotoxic T lymphocyte-associated protein 4; PD-1, programmed cell death protein 1; PD-L1, programmed cell death 1 ligand 1.