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. 2017 Oct 15;3(2):e000471. doi: 10.1136/rmdopen-2017-000471

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Osteoarthritis (A) and rheumatoid arthritis (RA) synovium (B). Synovial fibroblasts are found in the lining as well as in the sublining layer of the synovium. Thickening of the lining layer, lymphocytic infiltration and increased formation of blood vessels can be seen in RA synovium.