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. 2013 Sep 2;13(9):11507–11521. doi: 10.3390/s130911507

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© 2013 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 5. — Effect of mutations at Gln163. (A) The Gln163Lys and Gln163Asp mutations abolish the response to Ca²⁺. (B) The Gln163Met mutant retains a response to Ca²⁺. (C) In the X-ray structure of mCherry (PDB ID 2H5Q) [24], Gln163 is directed into the interior of the protein in close proximity to the chromophore. Compare the orientation of Gln163 with the orientation of Lys163 in R-GECO1 as shown in Figure 1B.