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Fig. 5. Staining specificity of different focal adhesion kinase (FAK) antibodies. Immmunocytochemical analysis of FAK in parallel cryosections of fast-twitch normal extensor digitorum longus (N-EDL) muscle with polyclonal A-17 (A) and monoclonal FAK antiserum 2A7 (B). Positive staining is orange and nuclei appear blue. A control reaction with normal rabbit serum is also shown (C). Arrows indicate FAK immunoreactivity at the sarcolemma. Scale bar, 100 µm.