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. 2017 Jul 10;7:4944. doi: 10.1038/s41598-017-05095-5

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Average conformations of intracellular loops and selected charged/polar residues of (A) apo mGlu4 (green) and (B) apo mGlu5 (cyan), obtained from 2.5–5 µs of respective MD simulations. Relevant structural features are labelled, i.e. intracellular loops (ICLs) and intramolecular locks, i.e. K673-E783 in mGlu4 ionic-lock and K665-E770 in mGlu5 ionic-lock.