A, in Ephx2(−/−) mice treated with vehicle, pancreases showed no apoptotic cell. In Ephx2(+/+) mice treated with vehicle, pancreases showed no apoptotic cell. On day 14 after STZ treatment, representative pancreatic photomicrography showed two apoptotic cells in islet of Ephx2(−/−) mice. On day 14 after STZ treatment, representative pancreatic photomicrography showed six apoptotic cells in islet of Ephx2(+/+) mice. B, quantification analysis of TUNEL assay showed that islet cell apoptosis in the STZ-Ephx2(+/+) group is significantly higher than in the STZ-Ephx2(−/−) group; n = 4. ∗, P < 0.05 versus STZ-Ephx2(+/+) mice.