AD	Alzheimer’s disease
ACN	Acetonitrile
CORT	Corticosterone
CRS	Chronic restraint stress
DG	Dentate gyrus
EPM	Elevated plus maze
ESI+	Electrospray ionization positive
FAO-PWY	Fatty-acid-oxidation superpathway
FDR	False discovery rate
FITC	Fluorescein isothiocyanate
FMT	Fecal microbiota transplantation
FST	Forced swim test
GV-971	Sodium oligomannate
H&E	Hematoxylin and eosin
HPA	Hypothalamic–pituitary–adrenal
IBA1	Ionized calcium-binding adapter molecule 1
KO	KEGG ortholog
KYNA	Kynurenic acid
KYN	Kynurenine
LDA	Linear discriminant analysis
LEfSe	Linear discriminant analysis effect size
MDD	Major depressive disorder
MFI	Mean fluorescence intensity
MRM	Multiple reaction monitoring
NE	Norepinephrine
NMDS	Non-metric multidimensional scaling
OFT	Open field test
PCoA	Principal coordinate analysis
PERMANOVA	Permutational multivariate analysis of variance
PLS-DA	Partial least squares discriminant analysis
QUIN	Quinolinic acid
SCFA	Short-chain fatty acid
SEM	Standard error of the mean
SSRI	Selective serotonin reuptake inhibitor
TCA	Tricarboxylic acid
TMAO	Trimethylamine oxide
TST	Tail suspension test
Trp	Tryptophan
5-HIAA	5-hydroxyindoleacetic acid
5-HT	5-hydroxytryptamine/serotonin
ZF	Zona fasciculata