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Schematic diagram of the experimental process and study design. DSS, dextran sodium sulfate. Saline, G1-G6 were administrated with saline from day 7 to day 14; Sacrifice I, half of the rats in G1 and G2; Sacrifice II, all of the remaining rats; CO, clinical observation; BW, body weight; G1, control group; G2, 5% DSS group; G3, prednisolone group; G4, vitamin D group; G5a-c, vitamin E (low, medium and high) groups; G6, vitamin D + vitamin E group; DSS, dextran sodium sulfate.
