C1GALT1 and type 2 diabetes mellitus: The additional insights obtained from T2D-primary tissues are also illustrated with C1GALT1 which is causally associated with T2D risk in skeletal muscle (OR=1.04, q-value=5.29×10−3) and pancreatic islets (OR=1.05, q-value=7.40×10−6), corroborated by colocalization evidence only when using a method that tests for multiple shared signals in the investigated genomic region.