| BGN4 | Bifidobacterium bifidum BGN4 |
| CD | cluster of differentiation: |
| FDA | USA Food and Drug Administration |
| GABA | γ-Aminobutyric acid |
| IFN | Interferon |
| IL | Interleukin |
| SAM | S-Adenosyl-l-Methionine |
| SEM | scanning electron microscope |
| TNF | tumor necrosis factor |
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