Fig. 2. Acidification responses at increasing 4-chloro-m-cresol (4-CmC) concentrations. (A ) Normalized increase in proton secretion rate recorded from a malignant hyperthermia–susceptible (MHS) culture. (B ) Rate recordings from a malignant hyperthermia–normal (MHN) culture. (C ) Concentrations of 4-CmC applied in the test.