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Antigen BackgroundCTLA-4, T-cell co-receptor cytotoxic T-cell antigen-4 (CTLA-4, CD152) is a critical inhibitory regulator of T-cell immunity. CTLA-4 is expressed almost exclusively on CD4+ and CD8+ T-cells and is crucial in the maintenance of T-cell homeostasis. Expression is induced on activated T-cells, with marginal expression on resting cells. The role of CTLA-4 in regulation of T-cell activity in the tumour microenvironment indicates a pote...