Programmed death-ligand 1 (<a rel="nofollow" href="https://immune-checkpoint.creative-biolabs.com/pd-l1-immune-checkpoint-molecule-for-drug-development.htm">PD-L1</a>), also well-known as B7-H1 and CD274, is a protein that acts as a kind of 'brake' to keep the body's immune responses under control.
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