Reversible blue light‐induced binding pairs between Fas‐CIB1‐EGFP and CRY2‐mCherry‐FADD were cotransfected into tumour cells, and FADD was found to translocate to Fas on the plasma membrane under blue light (488 nm) irradiation to induce cell apoptosis, thereby suppressing the growth of uveal melanoma in mice (Figure 5d). Here, FADD is linked to uveal melanoma.