PTGER4 and inflammatory bowel disease: Several of these genes stand as acknowledged IBD susceptibility genes or as genes of interest localized at convincingly replicated risk loci identified by GWAS (eg. ATG16L1, IL10, IL12B, JAK2, ARPC2, PTGER4, ZNF365, NKX2-3, PTPN2, PTPN22, C11orf30, ORMDL3, STAT3).