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. 2014 Jun 24;9(6):e99136. doi: 10.1371/journal.pone.0099136

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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(A) The structure of the orange form of the PSmOrange chromophore. (B) The modeled structure of the photoconverted far-red form of the PSmOrange chromophore. (C) The structure of the DsRed chromophore.