Fig. 4. Representative experimental traces of oxygen consumption by muscle mitochondria from control lizard energised with succinate (for details, see Materials and methods). (A) Mitochondrial state 4, state 3 (addition of 1 mmol l^–1 ADP) and state 4+ (addition of 1 µg ml^–1 oligomycin). (B) Effect of two sequential additions of 1 mmol l^–1 GDP on state 4 mitochondrial oxygen consumption.