Glucose-dependent insulinotropic polypeptide (GIP) has been regionally localized to a gene cluster on human chromosome 17q. Genetic mapping through CEPH reference families demonstrated that GIP was tightly linked to NME1 and PPY and fully linked to HOXB6 and NGFR. High-resolution radiation hybrid mapping resolved the gene order as cen-PPY-HOXB6-NGFR-GIP-NME1-tel. GIP maps distal to NGFR with an estimated distance of 250 kb.
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