By Morton I. Grossman
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Additional info for Cellular Basis of Chemical Messengers in the Digestive System
Is it completely degraded? Or is it partially dismantled and subsequently reassembled and used again? All three ideas have been proposed. The concept of m e m b r a n e reutilization or recycling was introduced over 20 years ago (24), but the experimental evidence that bears on this problem has been contradictory and confusing until recently. This chapter presents a brief summary of the work done on this topic by our group in the last few years. The presentation will be brief and can best be considered an extended abstract included in this volume to introduce readers to this problem area.
Acta Paediatr. , 1977, Suppl. 270, 15-25. Emdin, S. , and Steiner, D . , A homologous insulin radioimmunoassay in a cyclostome, the Atlantic hagfish, Myxine glutinosa. Gen Comp. Endocrinol, 1980, 42:251-258. , Experimental diabetes research in fish. On the morphology and physiology of the endocrine pancreatic tissue of the marine teleost Cottus scorpius with special refer ence to the role of glutathione in the mechanism of alloxan diabetes using a modified nitroprusside method. , 1961, Suppl. 59, 1-122.
Panel C shows that PP immunoreactive cells only occur in the teleostean islets close to the GI tract and not in those close to the spleen. ) 28 S T U R E FALKMER et al. endocrine pancreas in close contact with the duodenum, possibly derived from the ventral anläge, and supplied by a separate main branch of the visceral arteries (39, 41). This observation may shed some light on the physiological function of PP, which is still essentially unknown (24), and also on the ontogeny of the mammalian endocrine pancreas (31, 34).