 | Patton, M.L.; Swaisgood, R.R.; Czekala, N.M.; White, A.M.; Fetter, G.A.; Montagne, J.P.; Rieches, R.G.; Lance, V.A., 1999. Reproductive cycle length and pregnancy in the southern white rhinoceros (Ceratotherium simum simum) as determined by fecal pregnane analysis and observations of mating behavior. Zoo Biology 18 (2): 111-127, figs. 1-4, tables 1-2
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 | Henry, S.; Lance, V.A.; Conlon, J.M., 1993. Purification and characterization of insulin and the C-peptide of proinsulin from Przewalski's horse, zebra, rhino, and tapir (Perissodactyla). General and Comparative Endocrinology 89: 299-308, figs. 1-3, tables 1-3
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 | Henry, J.S.; Lance, V.A.; Conlon, J.M., 1991. Primary structure of pancreatic polypeptide from four species of Perissodactyla (Przewalski's horse, zebra, rhino, tapir). General and Comparative Endocrinology 84: 440-446, figs. 1-3, tables 1-3
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