Fig. 2. Extended Hill plots of C. maenas Hc measured at 10°C in the absence (circles) and presence of 10 mmol l^–1 (triangles) and 50 mmol l^–1 (squares) L-lactate. Hc subunit concentration, 2.76 mmol l^–1. Open and closed symbols are data points where the MWC equation was fitted with q floating and fixed at 4, respectively, during the iteration (see Eqn 1). Mean pH=7.843±0.009.