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Representative full scan mass spectra of GABA and its isotopologues ( 13 C 1 13 C 4 ) detected in the mouse brain, cecum content, and liver after oral administration of 12 C-inulin or 13 C-inulin. Enlarged spectra in the m/z range of 106108 demonstrated the presence of a high abundance of 13 C 4 -GABA (m/z 108.0843) in the brain and cecum contents, suggesting that gut microbiome-derived GABA partially contributes to the brain pool of GABA

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