Parameters for diabetes in KK‐Ay/TaJcl (KK‐Ay), KK/TaJcl (KK), and ICR mice treated with or without azoxymethane (AOM). The data of the group treated with AOM six times are shown in an open box, and without AOM are shown in a closed box. Parameters for diabetes, such as blood glucose (a), serum insulin levels (b), serum leptin levels (c), and serum triglyceride levels (d) are shown in the indicated mice strain. Data are mean ± SD. *P < 0.05, **P < 0.01 vs ICR mice. +/+, C57BL/6J‐Ham‐+/+; Ay, C57BL/6J‐Ham‐Ay/+.