DAO and diabetes mellitus: Finally, we evaluated the effect of HSCT on autism markers in serum; we found that maternal diabetes induction (STZ‐HSCT/STZ/EMP) significantly decreased the ratio of GSH to GSG (Fig. 2I) and increased zenulin levels (Fig. 2M) but had no effect on DAO activity (Fig. 2N), compared with the control (CTL‐HSCT/CTL/EMP) group.