Fig. 6. Scan of SDS-PAGE gel showing myosin heavy chain (MHC) isoforms isolated from the cat lateral gastrocnemius muscle and from a rat skeletal muscle standard. Note that rat skeletal muscle contains a fourth isoform, Type IIb, which is not found in cat skeletal muscle. In the cat samples, the MHC Type I isoform migrates the furthest, followed by the Type IIx and Type IIa isoforms, respectively.