Highlightsd The latent bioreactive Uaa FSY enables PD-1(FSY) to bind to PD-L1 in covalent mode d PD-1(FSY) enhances the activation of T cells and CAR-T cells more than PD-1(WT)d PD-1(FSY) inhibits tumor growth more potently than PD-1(WT) in immune-humanized mice d FSY enables an affibody to bind to the HER2 receptor on cancer cells covalently
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