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Oxytocin Molecular Structure — Cyclic Nonapeptide with Disulfide Bridge
Description
This diagram illustrates the molecular structure of oxytocin, a cyclic nonapeptide composed of nine amino acids: Cys¹-Tyr²-Ile³-Gln⁴-Asn⁵-Cys⁶-Pro⁷-Leu⁸-Gly⁹-NH₂. The structure highlights the disulfide bond (S–S) formed between Cys¹ and Cys⁶, which stabilizes the cyclic conformation critical for receptor binding and biological activity. Each amino acid is labeled, and the terminal amidation is shown.
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