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Fig. 1. The relationship between normalized succinate dehydrogenase (SDH) and
normalized myofibrillar adenosine triphosphatase (mATPase) activity for the
motor unit fibers in the tibialis anterior (TA) of all control (A) and all
spinal cord isolated (SI, B) cats. Note the clusters for each fiber type,
particularly for the type I and type IIx fibers.