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(A) Human colonal sections double immunostained for homeobox D1 (HOXD1) and glucagon-like peptide-1 (GLP-1) as well as HOXD1 and glucose-dependent insulinotropic peptide (GIP), respectively. Scale bar: 10 μm. (B) Triple staining, including DAPI, also shows expression in the nucleus. Scale bar: 10 μm.
