Vasotocin is an oligopeptide homologous to oxytocin and vasopressin found in all non-mammalian vertebrates (including birds, fishes, and amphibians) and possibly in mammals during the fetal stage of development. Arginine vasotocin (AVT), a hormone produced by neurosecretory cells within the posterior pituitary gland (neurohypophysis) of the brain,...
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(from the article `endocrine system`) ...(except in Agnatha fishes, which produce only one). The oxytocin-like peptide is usually isotocin (most fishes) or mesotocin (amphibians, ...
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http://www.britannica.com/eb/a-z/v/9
<protein> Cyclic nonapeptide, related to vasopressin but found in birds, reptiles and some amphibians. ... (18 Nov 1997) ...
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Cyclic nonapeptide, related to vasopressin but found in birds, reptiles and some amphibians.
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Type: Term Pronunciation: vā′sō-tō′sin, vas-ō- Definitions: 1. A nonapeptide hormone of the neurohypophysis of subvertebrates, with activities similar to that of vasopressin and oxytocin; chemically identical with human vasopressin except for an isoleucyl residue at position 3; thus [3-isoleucine]vasopressin or [Ile3...
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http://www.medilexicon.com/medicaldictionary.php?t=97028
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