Fig. 8. TMRM fluorescence in G. dibranchiata coelomocytes exposed for 1 h to various sulfide concentrations (up to 0.73 mmol l^-1) either alone (circles) or with CCCP (0.10 mmol l^-1; squares) or PTP inhibitors (0.5 µmmol l^-1 CsA and 5 µmol l^-1 TFP; triangles). Fluorescence emission (595 nm) is normalized to control conditions (1 h exposure to buffer alone). Values are means ± S.D. (N=5). Asterisks represent a significant effect of sulfide, CCCP or CsA/TFP compared to the control value by two-factor, RM ANOVA (^*P<0.05, ^**P<0.01, ^***P<0.005). Refer to text for further results of statistical analyses.