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(A) Fluorescence enhancement (F/F0) of 5 μM SSP4 or SSP2 in the presence of varied concentrations of persulfidated papain. (B)/(C) Fluorescence intensity of 5 μM SSP4 for the detection of various concentrations of persulfidated and reduced BSA or GAPDH at (1) 30 μM and (2) 5 μM. Results are expressed as mean ± SEM (n = 3).
