Fig. 6. Total glutathione [2 oxidised (GSSG) + reduced (GSH); A] and reduced glutathione (B) concentration in smaller [A0–A4, open circles; shell height 50.45±4.04 mm (mean ± s.d.)] and bigger [B0–B4. filled circles; shell height 68.18±2.75 mm (mean ± s.d.)] A. opercularis individuals of group 0–4. N=9–17 per group for smaller and N=9–18 per group for bigger individuals. Groups with the same letter (small letters for smaller) are significantly different from each other (P<0.001). If more than two groups have the same letter, the group marked with an asterisk is significantly different to all other groups.