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Immunohistochemistry reveals reduced alpha dystroglycan protein in the muscle biopsy. Alpha-dystroglycan is a heavily glycosylated peripheral-membrane component of the dystrophin-associated glycoprotein complex (DAPC), which, in addition to laminin alpha2, binds perlecan and agrin in the extracellular matrix, whereas beta-dystroglycan, derived from the same gene, is a transmembrane protein that links to dystrophin intracellularly. [HPO:probinson, PMID:11592034, UToronto:htrang]
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