PROBLEM TO BE SOLVED: To provide a novel gastrointestinal tract inflammation therapeutic agent, particularly an inflammatory bowel disease (IBD) therapeutic agent.SOLUTION: The inventors confirm that a fat tissue-derived interstitial cell group has the ability to improve inflammation well, and provide a gastrointestinal tract inflammation therapeutic agent comprising at least a fat tissue-derived interstitial cell group, more preferably an uncultured (un-subcultured) fat tissue-derived interstitial cell group.SELECTED DRAWING: None
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