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Transient FAK phosphorylation in the presence of tenascin-C. NIH 3T3 fibroblasts were allowed to adhere to fibrin-FN+/−70Ten matrices for 15, 30, and 60 min before lysis and immunoprecipitation with anti-FAK antibodies. Proteins were separated by SDS-PAGE, and immunoblots were probed with an anti-FAK mAb to detect total cellular FAK and an antiphosphotyrosine mAb to detect active FAK.
