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A model of α-dystroglycan interactions in the muscle plasma membrane. α-Dystroglycan binds the G-domain containing proteins agrin, laminin, and perlecan in a manner that requires glycosylation of the mucin-like middle third of the molecules. Biglycan, in a fashion dependent on its chondroitin sulfate side chains, binds to the protein core of the COOH-terminal third of α-dystroglycan. See text for details.
