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The Authors' reply We would like to thank Op De Beéck et al1 for their interest in the evaluation of antibodies to the zymogen granule membrane glycoprotein 2 (GP2) in patients with inflammatory bowel disease (IBD). Their meticulous investigation of a large, well-characterised cohort of patients and controls revealed good reproducibility, linearity and robustness of the anti-GP2 assays, confirming the assay performance reported in a recent study by our group.2 Both studies found a comparable, high specificity of anti-GP2 for Crohn's disease (CD). On testing 100 patients with ulcerative colitis (UC) and 162 blood donors (BDs) as controls in our study, the specificity reached a value of 94.3% (95% CI 90.7% to 96.8%). This value is similar to the specificity of 93.9% reported by Op De Beéck et al, including 118 UC …

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