ERAP2 and Crohn disease: In blood, there was a highly significant (FDR corrected P = 1.27 × 10− 131) association between rs2549794 at a Crohn's disease locus (Franke et al., 2010) and expression of ILMN_1743145, which maps to the LRAP/ERAP2 gene (Fig. 5A).