5-HIAA	5-hydroxyindole-3-acetic acid
5-HT (serotonin)	5-hydroxytryptamine
5-HTOL	hydroxytryptophol
5-HTP	5-hydroxytryptophan
Ach	acetylcholine
AFADESI-MSI	airflow-assisted desorption electrospray ionization mass spectrometry imaging
AKT	protein kinase B
BDNF	brain-derived neurotrophic factor
CUMS	chronic unpredictable mild stress
DA	dopamine
DDC	DOPA decarboxylase
ELISA	enzyme-linked immunosorbent assay
EPMT	elevated plus maze test
FLX	fluoxetine
FST	forced swimming test
GABA	gamma-aminobutyric acid
GAPDH	glyceraldehyde-3-phosphate dehydrogenase
GBA	gut–brain axis
GLRRTF	Ganoderma lucidum and Rosa roxburghii Tratt formulation
H&E	hematoxylin and eosin
HPA	hypothalamic–pituitary–adrenal
IA	3-indoleacrylic acid
IAA	indole-3-acetic acid
IS	3-indoxyl sulphate
NE	norepinephrine
OFT	open field test
PCA	principal component analysis
PI3K	phosphatidylinositol 3-kinase
SPT	sucrose preference test
TPH2	tryptophan hydroxylase 2
TrkB	tropomyosin receptor kinase B
TST	tail suspension test
VIP	variable importance in projection