Fig. 6From: Rheumatoid arthritis antigens homocitrulline and citrulline are generated by local myeloperoxidase and peptidyl arginine deiminases 2, 3 and 4 in rheumatoid nodule and synovial tissueOA synovial tissue histology. a H&E, (b) citrulline and homocitrulline (F95), (c) PAD2, (d) PAD3, (e) PAD4 and (f) MPO staining. The scale bar indicates 50 μm. L lumen of synovial cavity, blue arrow synovial lining layer, double-headed arrow synovial stromaBack to article page