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. 2016 Aug 18;9:78. doi: 10.1186/s13041-016-0255-x

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Coexpression of PK2 and OPN4 in retinal ganglion cells of the mouse retina. The PK2 immunostaining is shown as green (a) whereas the OPN4 fluorescent immunolabeling is shown in red (b). The nuclear counterstaining is shown as blue (c). Coexpression of PK2 and OPN4 in the retinal ganglion cells is apparent (d). Two cells strongly immunostained by PK2 and OPN4, indicated by arrows, are shown. Scale bar, 40 μm