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Fluorescence changes of cpsfGFP-Tyr66ViP in response to different metal ions after 90 minutes of incubation. 1, blank (no metal ion added); 2, Zn2+; 3, Mg2+; 4, Fe2+; 5, Mn2+; 6, Cu2+; 7, Co2+; 8, Pd2+; 9, Cr3+; 10, Pb2+ (2–10, 100 μM); 11, 1 μM HgCl2; 12, 10 μM HgCl2.
