Within our data set, the strongest evidence for association was for duplications at ATF7IP2 (encoding activating transcription factor 7—interacting protein 2) located at 16p13.2–p13.13, which was found in eight BD cases (0.31%) and in four controls (0.045%, two-sided Fisher's exact test, P=1.4 × 10−3). Here, ATF7IP2 is linked to Behcet disease.