5-HT	Serotonin
ACTH	Adrenocorticotropic hormone
ANOVA	Analysis of variance
BLA	Basolateral amygdala
BST	Bed nucleus of the stria terminalis
CeA	Central amygdala
CHO	Chinese hamster ovary
CORT	Corticosterone
CNS	Central nervous system
CRF	Corticotropin-releasing factor
CUMS	Chronic unpredictable mild stress
DAB	3,3′-Diaminobenzidine
DARK	Dark room
DMTS	Dimethyl trisulfide
DR	Dorsal raphe nucleus
ELISA	Enzyme-linked immunosorbent assay
ER	Endoplasmic reticulum
EWcp	Centrally projecting Edinger–Westphal nucleus
FTS	Forced swim test
GH	Group holding
H2O2	Hydrogen peroxide
H2S	Hydrogen sulphide
HPA	Hypothalamic–pituitary–adrenal
IHC	Immunohistochemistry
i.p.	Intraperitoneal
ISOL	Social isolation
KO	Knockout
LS	Lateral septum
MBT	Marble burying test
MeA	Medial amygdala
mPFC	Medial prefrontal cortex
OFT	Open field test
PACAP	Pituitary adenylate cyclase-activating polypeptide
PAG	Periaqueductal grey matter
PBS	Phosphate-buffered saline
POLY	Inorganic polysulfide
PTSD	Post-traumatic stress disorder
PVN	Paraventricular nucleus of the hypothalamus
PVT	Paraventricular nucleus of the thalamus
REST	Restraint stress
SHAKE	Shaker stress
SPT	Sucrose preference test
TILT	Tilted cage
TRPA1	Transient receptor potential ankyrin 1
TST	Tail suspension test
UCN1	Urocortin 1
WET	Wet bedding
WM	Body weight measurements
WT	Wild-type