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The levels of gastrointestinal regulatory peptides in serum of mice. ET-1 (A). SP (B). GAS (C). SS (D). MTL (E). VIP (F). There is a significant difference between the bacterial intervention group and the model group, where * means P < 0.05, **P < 0.01, ***P < 0.005, ****P < 0.001.
