Figure 5From: Increased expression of carbonic anhydrase I in the synovium of patients with ankylosing spondylitis Detection of CA1 level in synovial fluids by ELISA. Levels are represented as O.D. values obtained from the absorbance at 405 nm. The results are expressed as the mean ± SEM. Expression of CA1 was higher in AS samples than in OA samples.Back to article page