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. 2019 Jun 21;11(6):365. doi: 10.3390/toxins11060365

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© 2019 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 (http://creativecommons.org/licenses/by/4.0/).

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Interactions in Cluster_II. The cluster of residues around the conserved Leu^α3 (circled label) in Cluster_II is shown in this set of six overlaid C3 structures. The side-chains are shown for Arg ^β6/7 (dark blue), Tyr ^β2/3 (mauve), Leu^α3 (grey), Ile/Phe/Tyr^α3 (light blue), Leu/Phe^α3,4 (cyan) and Ile/Val^α4 (green). The residue nomenclature is as follows: the superscript refers to the alpha or beta secondary structure followed by the strand or helix number in the C3bot1 structure (PDB:1G24).