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To date there is suggestive evidence that phosphatidylinositol 3-kinase participates in insulin-stimulated glucose transport. However, its involvement in skeletal muscle, a major site of insulin-stimulated glucose disposal, has not been addressed. Therefore, we tested the effects of wortmannin, a known inhibitor of phosphatidylinositol 3-kinase, on insulin-stimulated 2-deoxyglucose uptake by rat soleus...