the use of various modifications in the second dimension of two-dimensional gel electrophoresis has allowed us to separate completely the alpha subunits of slow and fast muscle tropomyosin and to show that : 1 ) the cardiac alpha subunit is distinct from either the slow alpha or the fast alpha subunit and 2 ) in vitro differentiated cells synthesize a tropomyosin which , by co-migration under various conditions , is identical with fast muscle tropomyosin .
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differentiated
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cells