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. 2016 Sep 8;6:32504. doi: 10.1038/srep32504

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Typical fluorescence spectrum for various samples (a) Golden delicious, (c) McIntosh and (e) Empire, respectively. Evolution of firmness (black squares, left y-axis) ChlF signal (blue squares, right y-axis) over time for the varieties (b) Golden delicious, (d) McIntosh and (f) Empire, respectively. (Insets) Photographs of the samples along with a magnified image of the region that was tested.