| Abstract: | Nitric oxide synthase (NOS) activity was measured in extensor digitorum longus (EDL) and soleus muscles during postnatal development in the rat. At 1 and 2 weeks of age, similar low levels were found in both muscles. After 2 weeks, activity increased significantly only in EDL. Adult NOS activity was significantly higher in EDL than soleus. Thus, the preferential expression of NOS in fast muscle only occurs once the adult pattern of motor activity is established. © 1998 John Wiley & Sons, Inc. Muscle Nerve 21:1344–1346, 1998. |
