Serum kallistatin levels were significantly lower in controls (7.09 ± 1.91 μg/mL) and NDO subjects (7.08 ± 1.96 μg/mL) compared to T2D patients (8.21 ± 1.70 μg/mL; p = 0.004 and p = 0.010, respectively; Figure 1). Here, SERPINA4 is linked to type 2 diabetes mellitus.