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Human GNAS wild-type allele is located in the vicinity of 20q13.3 and is approximately 71 kb in length. This allele, which encodes neuroendocrine secretory protein 55, protein ALEX and guanine nucleotide-binding protein G(s) subunit alpha isoforms short and XLas, is involved in the mediation of G-protein coupled receptor-dependent signal transduction. Mutations in this gene are associated with Albright\'s hereditary osteodystrophy.
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