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Vasoactive intestinal polypeptide (VIP) was isolated in two molecular forms from an extract of the gastroenteropancreatic system of the pallid sturgeon Scaphirhynchus albus (Acipenseriformes). VIP-1 was identical to the peptide previously isolated from the rainbow trout Oncorhynchus mykiss and the bowfin, Amia calva, consistent with the proposed sister group relationship of the Acipenseriformes and...
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