Fig. 8. Sarcolemmal focal adhesion kinase (FAK) immunoreactivity in muscle fibres during the fast- to slow-twitch transformation. Sarcolemmal FAK immunoreactivity (A, serum A-17; B, control reaction) and fibre type (C, slow myosin; D, fast myosin) were determined on consecutive cryosections from an extensor digitorum longus muscle 8 months after autografting and reinnervation (T-EDL) with the nerve of the slow-twitch soleus muscle. The fibre types are indicated. Scale bar, 100 µm.