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. 2020 May 6;11:408. doi: 10.3389/fphys.2020.00408

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Copyright © 2020 Wang, Xu, Mou, Kong, Wu, Xue and Xu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Fluorescent terminal deoxynucleotidyl transferase biotin-dUTP nick end labeling (TUNEL) staining of HG in hamsters in three photoperiodic groups. Immunofluorescence histochemistry showing cell apoptosis, cell boundaries, and nuclei. Blue represents 4′6′-diamidino-2-phenylindole (DAPI)-stained nucleus, red represents Alexa Fluor 647-stained laminin of interstitial tissue, green represents TUNEL by FITC. Scale bar = 50 μm. SP, short photoperiod; MP, moderate photoperiod; LP, long photoperiod.