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. 2014 May 5;15(5):7594–7610. doi: 10.3390/ijms15057594

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© 2014 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 license (http://creativecommons.org/licenses/by/3.0/).

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Figure 2. — An illustration to show Chou’s scheme for peptides with (2ξ + 1) residues and their centers being (a) proline and (b) lysine. Adapted from Chou [27,29] with permission.