(a) Insolubilization of Keap1 in Atg7-deficient hepatocytes. Liver homogenates from Atg7F/F:Mx1 mice on various days after injection of poly(I)•poly(C) were separated into detergent-soluble and detergent-insoluble fractions with 0.5% Triton X-100. Each fraction was subjected to SDS-PAGE and analysed by immunoblotting with the indicated antibodies. The data displayed are representative of three separate experiments. 