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Bovine thyrocalcitonin has been isolated in homogeneous form, and its complete amino acid sequence determined. The bovine hormone is a singlechain 32 amino acid polypeptide. It contains a 1-7 amino terminal disulfide bridge, and the carboxyl terminal amino acid is prolinamide. The bovine thyrocalcitonin sequence differs from the porcine sequence by three amino acid residues and from the human sequence by 18 amino acid residues.
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Brewer et al. (1969) studied this question.
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