One of the examples was gastrin releasing peptide (GRP, encoded by GRP), for which we observed strong evidence of colocalization (PP=82.5%) between plasma levels and type 2 diabetes (T2D) risk at an established genome-wide association study (GWAS) locus (18q21) for which different genes had been prioritized, including SEC11C, GRP, and MC4R (22–24). Here, MC4R is linked to type 2 diabetes mellitus.