Statistical fine-mapping indicates that the human IL2RA locus contains multiple independent signals, including one association refined to a single putative causal variant (rs61839660 C>T) that paradoxically confers risk for Crohn's disease but protection against type 1 diabetes mellitus (Burren et al., 2017; Huang et al., 2017; Maier et al., 2009; Onengut-Gumuscu et al., 2015). Here, IL2RA is linked to diabetes mellitus.