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TIGIT is an inhibitory receptor containing T cell immunoglobulin and immune receptor protein tyrosine inhibitory motif domain. It shows high expression level on the surface of immune cells in tumor patients and plays an inhibitory role by binding to corresponding ligands, CD155 and CD112. Studying the mechanism of inhibitory effect of TIGIT and the way to block it shows a great significance in the immunotherapy of tumor. In this review, the structure of TIGIT molecule and its inhibitory effect on immune cells(including NK cells and T c