GRIN2A and Behcet disease: The gene, GRIN2A encoding glutamate receptor, ionotropic, N-methyl-D-aspartate, subunit 2A, lies downstream of ATF7IP2. Its first exon is disrupted in seven BD cases and five controls (0.27% BD vs 0.057% controls, two-sided Fisher's exact test, P=8.1 × 10−3).