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Comparative analyses of the cytoskeletons of resting and stimulated platelets point out the involvement of a 79 kDa polypeptide in the activation step and its increased incorporation during aggregation. It appears as a doublet and cross-reacts with an antibody to chicken gizzard caldesmon, whereas no 150 kDa immunoreactive form was detected. α-Actinin and gelsolin were detected only in the aggregation...
A troponin I-like factor has been purified from pig platelet by G150 Sephadex filtration of a low ionic strength extract, acidification at pH 4.2, ion exchange on DE-52 cellulose, and affinity chromatography on calmodulin-Sepharose. This protein (M r 17000), together with pig brain calmodulin and platelet tropomyosin, is able to participate to the reconstitution in vitro of a thin filament-like...
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