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An African ancestry-specific allele of CTLA4 confers protection against rheumatoid arthritis in African Americans.
Kelley JM, Hughes LB, Faggard JD, Danila MI, Crawford MH, Edberg Y, Padilla MA, Tiwari HK, Westfall AO, Alarcón GS, Conn DL, Jonas BL, Callahan LF, Smith EA, Brasington RD, Allison DB, Kimberly RP, Moreland LW, Edberg JC, Bridges SL Jr. Kelley JM, et al. PLoS Genet. 2009 Mar;5(3):e1000424. doi: 10.1371/journal.pgen.1000424. Epub 2009 Mar 20. PLoS Genet. 2009. Retraction in: PLoS Genet. 2009 Dec;5(12). doi: 10.1371/annotation/80bd7285-9d2d-403a-8e6f-9c375bf977ca PMID: 19300490 Free PMC article. Retracted.