| AS | ankylosing spondylitis |
| SpA | spondyloarthritides; |
| mSASSS | modified Stoke Ankylosing Spondylitis Spinal Score |
| HLA-B27 | human leukocyte antigen B27 |
| MICA | major histocompatibility complex class I chain-related gene A |
| NKG2D | receptor natural killer group 2, member D |
| SNP | single nucleotide polymorphism |
| sMICA | soluble MICA |
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