Fig. 2. Emission spectra of TMRM (A) and JC-1 (B) in sulfide-free incubation buffer (black, lower line) or in incubation buffer with 1.9 mmol l^-1 sulfide (red, upper line). Note that the green fluorescence of the monomeric form of JC-1 did not contribute significantly to JC-1 emission spectra in this preparation.