Variation in the CTLA4/CD28 gene region confers an increased risk of coeliac disease. by Popat, S, Hearle, N, Hogberg, L, Braegger, C, O'Donoghue, D, Falth-Magnusson, K, Holmes, G, Howdle, P, Jenkins, H, Johnston, S, Kennedy, N, Kumar, P, Logan, R, Marsh, M, Mulder, C, Torinsson Naluai, A, Sjoberg, K, Stenhammar, L, Walters, JR, Jewell, D, Houlston, R