Abstract
THE chemical examination of neurohypophysial hormones of a dozen species belonging to four classes of vertebrates have revealed the existence in each case of two peptide hormones having parental structures. These structures appear rather stable in a given class but vary from one class to the other. Thus one finds the same oxytocin and the same arginine-vasopressin in four mammalian species and the same isotocin and the same vasotocin in three species of marine bony fishes1–4. However, among the mammals, the pig is an exception since, instead of arginine-vasopressin, lysine-vasopressin5 was found and some variations are therefore possible in other species of this class.
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ACHER, R., CHAUVET, J. & CHAUVET, M. Isolation of Finback Whale Oxytocin and Vasopressin. Nature 201, 191–192 (1964). https://doi.org/10.1038/201191a0
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DOI: https://doi.org/10.1038/201191a0
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