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Molecular assay reagents intended to identify mutations in the patched homologue (PTCH) gene, located at chromosome 9q22.3, which encodes for a protein implicated in the formation of embryonic structures and in tumorigenesis and that functions as a tumor suppressor. This genetic mutation has been identified in patients with holoprosencephaly-7 and nevoid basal cell carcinoma syndrome (NBCSS), also known as Gorlin\'s syndrome.
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