| SCFA | short-chain fatty acid |
| Th2 | T helper 2 |
| HMOs | human milk oligosaccharides |
| URECA | Urban Environment and Childhood Asthma |
| ISAAC | International Study of Asthma and Allergies in Childhood |
| FLVR | Faecalibacterium, Lachnospira, Veillonella, and Rothia |
| Treg | regulatory T |
| HDAC | histone deacetylase |
| HDACs | histone deacetylases |
| IL | interleukin |
| AhR | aryl hydrocarbon receptor |
| 12,13-diHOME | 12,13-dihydroxy-9Z-octadecenoic acid |
| GPRs | G protein-coupled receptors |
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