Figure 1From: Expanding the armamentarium for the spondyloarthropathiesIn situ hybridization analysis demonstrates large amounts of tumor necrosis factor (TNF) mRNA, in sites of bony remodeling in a patient with ankylosing spondylitis. TNF is a proinflammatory cytokine. Reproduced with permission from John Wiley & Sons, Inc. [16]. © 1995 American College of RheumatologyBack to article page