IBD	Inflammatory bowel disease
CRP	C-reactive protein
4EPS	4-ethyl phenyl sulfate
BBB	Blood–brain barrier
GABA	Gamma-aminobutyric acid
IL	Interleukin
HPA	Hypothalamic–pituitary–adrenal
DNA	Deoxyribonucleic acid
RNA	Ribonucleic acid
BDNF	Brain-derived neurotrophic factor
5-HTP	5-hydroxytryptamine
SDV	Subdiaphragmatic vagotomy
LPS	Lipopolysaccharides
MDD	Major depressive disorder
SSRIs	Selective serotonin reuptake inhibitors
FRL	Flinders resistant line
GI	Gastrointestinal
IBS	Irritable bowel syndrome
FA	Fatty acids
TCAs	Tricyclic antidepressants
SNRIs	Serotonin-norepinephrine reuptake inhibitors
BZDs	Benzodiazepines
MAOI	Monoamine oxidase inhibitors
FDA	Food and Drug Administration
FMT	Fecal microbiota transplantation
FOS	Fructo-oligosaccharides
GOS	Galacto-oligosaccharides
mRNA	Messenger ribonucleic acid