Structure of a mammalian hormone oxtocin

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Question: The structure of a mammalian hormone oxtocin, a nine-amino acid polypeptide as follows:  cys-tur-ile-glan-asn-cys-pro-leu-gly. At the carboxyl end, the -OH is replaced by an amino group.  

[1] Where is the disulfide bridge?
[2] Draw the hormone and show all the side chains.  (I think leu is one of them).

Reference no: EM1381492

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