Figure 4From: Increased expression of carbonic anhydrase I in the synovium of patients with ankylosing spondylitis Immunodetection of CA1 in the synovial membranes of AS, RA and OA patients. CA1 was significantly detected with a strong immunosignal in AS synovial tissue. Original magnification: 100X and 200X. The picture at the bottom is a negative control prepared with AS synovial tissue that was not treated with primary antibody.Back to article page