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. 2021 Jun 3;13(6):830. doi: 10.3390/pharmaceutics13060830

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Scheme 1 — (A) Metformin and (B) amino acid sequence and NMR structure of hIAPP (PDB: 2KB8). The side chains of Cys [2] and Cys [7] are shown in yellow to illustrate the disulfide bond.