AID	Activation-induced cytidine deaminase
ANS	Autonomic nerve system
CD	Cluster of differentiation
CNS	Central nervous system
CXCL16	Chemokine (C-X-C motif) ligand 16
EAE	Experimental autoimmune encephalomyelitis
ENS	Enteric nervous system
FoxP3	Forkhead box P3
GABA	Gamma-aminobutyric acid
GALT	Gut-associated lymphatic tissue
HPA axis	Hypothalamic–pituitary–adrenal axis
IBD	Inflammatory bowel disease
IFN	Interferon
IgA	Immunoglobulin A
IL	Interleukin
ILC	Innate immune lymphoid cell
MAMP	Microbial-associated molecular pattern
MS	Multiple sclerosis
NK cell	Natural killer cell
NMO	Neuromyelitis optica
PD-1	Programmed cell death 1
PSA	Polysaccharide A
RORγt	Retinoic acid receptor-related orphan receptor-γt
SCFA	Short-chain fatty acids
SFB	Segmented filamentous bacteria
TGFβ1	Transforming growth factor β1
Th1 cell	T helper cell type 1
Th17 cell	T helper cell type 17
TLR	Toll-like receptors
TNFα	Tumor necrosis factor α
Treg cell	Regulatory T cell