An African ancestry-specific allele of CTLA4 confers protection against rheumatoid arthritis in African Americans. by James M Kelley, Laura B Hughes, Jeffrey D Faggard, Maria I Danila, Monica H Crawford, Yuanqing Edberg, Miguel A Padilla, Hemant K Tiwari, Andrew O Westfall, Graciela S Alarcón, Doyt L Conn, Beth L Jonas, Leigh F Callahan, Edwin A Smith, Richard D Brasington, David B Allison, Robert P Kimberly, Larry W Moreland, Jeffrey C Edberg, S Louis Bridges

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