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Molecular assay reagents intended to identify deletions or duplications of the crumbs 1, cell polarity complex component (CRB1) gene, located at chromosome 1q31.3, which encodes the protein crumbs homolog 1. Genetic variants at this locus have been associated with Leber congenital amaurosis 8, pigmented paravenous chorioretinal atrophy, and retinitis pigmentosa 12.
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