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PD-1 PD-L1 Pathway in Cancer


Immune checkpoints refer to a plethora of inhibitory pathways hardwired into the immune system that are crucial for maintaining self-tolerance and limiting collateral tissue damage during anti-microbial immune responses. Checkpoint molecules include Cytotoxic T Lymphocyte Antigen-4 (CTLA-4), Programmed Death-1 (PD-1), Lymphocyte Activation Gene-3 (LAG-3), and T-cell immunoglobulin and Mucin protein-3 (TIM-3) as well as several others (Ref.1). PD-1, an immunoinhibitory receptor of the CD28 family, is a type 1 trans-membrane prote...




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