(A) Representative traces showing SQR-driven oxygen consumption in 3x106 control (C) and five patientsfibroblasts (P1-5) in the absence (solid traces) or presence (dashed traces) of CoQ10 in the culture medium. See Materials and Methods for the role and concentration of the compounds used. (B) Relative rates of SQR-driven oxygen consumption are normalized to CIV respiration rates. 