SERPINE1 and type 2 diabetes mellitus: The levels of hormones of the gastroduodenal zone, adipokines, and PAI-1 on an empty stomach (odd numbers of groups) and after a test breakfast (even numbers of groups) were studied in the following groups of patients: 1 and 2 – healthy volunteers, 3 and 4 – a comparison group of obese patients without T2DM, 5 and 6 – obese patients with T2DM, 7 and 8 – obese patients with T2DM 6 months after LSG, and 9 and 10 – obese patients with T2DM 6 months after RYGB (Figure 2).