Hello Chakib I can recommend this paper: Cutting Edge: Mast Cells Express IL-17A in Rheumatoid Arthritis Synovium. Axel J Hueber, Darren L. Asquith, Ashley M. Miller, Jim Reilly, Shauna Kerr, Jan Leipe, Alirio J. Melendez, Iain B. McInnes. J Immunol. 2010, 184:000-000 ahead of print. Jim Reilly