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Fluorescence intensity of the probes (10 μM) in the presence of various reactive sulfur species: (1) control; (2) 50 μM Na2S; (3) 200 μM Na2SO3; (4) 200 μM Na2S2O3; (5) 200 μM Na2SO4; (6) 1 mM Cys; (7) 1 mM GSH; (8) 50 μM Na2S + 1 mM Cys; (9) 50 μM Na2S + 1 mM GSH. SeP1 (A), SeP2 (B).
