... in the c oncentrations of rat live r cyclic AMP and of serum glucose, free fatty acids, insulin, pancreatic andtotalglucagoninthemanandintherat.J. Lat. Clin. Med. 82,957±967.5. Matschinsky, ... function of mitochon-dria during intrauterine life. A lower activity of all threeactivities in fetal than adult pancreatic islets, but a similarity in the index of respiratory enzyme to citrate synthaseFig. ... affect the ATP-sensitive K+channels and, ®nally, the secretion of insulin. Bearing this in mind, we determined the activities of citrate synthase (an enzyme of the Krebscycle re¯ecting the number...