SpA	Spondyloarthritis
AS	Ankylosing spondylitis
PsA	Psoriatic spondylitis
re-SpA	Reactive spondylitis
uSpA	Undifferentiated arthritis
IBD	Inflammatory bowel disease
Ps	Psoriasis
RA	Rheumatoid arthritis
IL-23	Interleukin-23
IL-17	Interleukin-17
IL-17R	Interleukin-17 receptor
Th1	Type 1 helper T cell
Th2	Type 2 helper T cell
Th17	Type 17 helper T cell
TCR	T cell receptor
CTL	Cytotoxic T lymphocyte
HLA	Human leukocyte antigen
MHC	Major histocompatibility complex
ERAP1	Endoplasmic reticulum aminopeptidase 1
ER	Endoplasmic reticulum
SFB	Segmental filamentous bacteria
APC	Antigen presenting cells
DC	Dendric dell
RANKL	Receptor activator of NF-κB ligand
NF-kB	Nuclear factor kappa-light-chain-enhancer of activated B cells
TNF-α	Tumor necrosis factor α
ILC3	Type 3 innate lymphoid cells
MAIT	Mucosa-associated invariant T (MAIT) cells