ACPA	Anti-citrullinated protein antibody
CRP	C-reactive protein
DMARD	Disease modifying anti-rheumatic drug
ECM	Extracellular matrix
ESR	Erthrocyte sedimentation rate
FLS	Fibroblast-like synoviocyte
GM-CSF	Granulocyte-macrophage colony-stimulating factor
IFN-$\gamma$	Interferon-$\gamma$
IFX	Infliximab
IL-‘x’	Interleukin-‘x’
MMP	Matrix metalloproteinase
MTX	Methotrexate
NF-$\kappa$B	Nuclear factor-$\kappa$ B
NSAID	Non-steroidal anti-inflammatory drug
ODE	Ordinary differential equation
PDE	Partial differential equation
RA	Rheumatoid arthritis
RANK(L)	Receptor activator of NF-$\kappa$B (ligand)
TCZ	Tocilzumab
TIMP	Tissue inhibitor of metalloproteinase
TNF-$\alpha$	Tumour necrosis factor-$\alpha$
TNFi	TNF-$\alpha$ inhibitor