Aa	Aggregatibacter actinomycetemcomitans
ACPA	anti-citrullinated protein antibody
APCs	antigen presenting cells
C5a	complement 5a
CCPs	cyclic citrullinated peptides
ERK	extracellular signal-regulated kinases
Fab	antigen-binding fragment
Fc	crystallizable fragment
FcγR	Fc gamma receptor
HLA	human leukocyte antigen
IC	immune complex
IFNγ	interferon-gamma
IL	Interleukin
JNK	c-Jun N-terminal kinase
MAC	membrane attack complex
MMPs	matrix metalloproteinases
NET	neutrophil extracellular trap
PAD	peptidyl arginine deiminase
P. gingivalis	Porphyromomas gingivalis
RA	rheumatoid arthritis
RF	rheumatoid factor
ROS	reactive oxygen species
SE	shared epitope
M-CSF	macrophage colony-stimulating factor
NF-κB	nuclear factor-kappaB
RANKL	receptor activator of nuclear factor kappa-Β ligand
TLR	Toll-like receptor
TNF-α	tumor necrosis factor-alpha