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. 2016 Jan 29;10:5. doi: 10.3389/fnana.2016.00005

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Copyright © 2016 Fernández-López, Romaus-Sanjurjo, Senra-Martínez, Anadón, Barreiro-Iglesias and Rodicio.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and reproduction in other forums is permitted, provided the original author(s) or licensor 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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Photomicrographs of transverse sections of the retina showing anti-cytokeratin immunoreactivity. (A) Prolarval retina. (B) Retina of a small larva. (C,D) Retina of a premetamorphic larva (C) and detail of the ON (D). (E,F) Retina of postmetamorphic (E) and upstream migrating adult (F) sea lampreys. Cytokeratin-ir Müller cells (thick arrows) were observed in the prolarval (A), small larval (B) and postmetamorphic/adult (E,F) retinas. Note the lack of cytokeratin labeling in the premetamorphic retina (C), although the ON shows cytokeratin-ir astrocytes (thin arrows in D). In postmetamorphic/adult sea lampreys (E,F) only the inner processes of the Müller cells show anti-cytokeratin immunoreactivity. In all photomicrographs dorsal is up and medial is to the left. Scale bars: 12.5 μm in (E); 25 μm in (A,B,D); 50 μm in (F); 100 μm in (C).