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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 retina in prolarval sea lampreys showing hematoxylin-eosine (H-E) labeling (A,C,E) or doublecortin (DCX) immunoreactivity (B,D,F). The H-E and DCX panels are from different animals, but at similar levels. In the DCX panels the dashed lines indicate the limit between the retina and the brain (the brain is always to the left). (A) Retina of a pigmentation prolarva (a p3) showing the early retina (Ret), which is formed by undifferentiated cells. Note the presence of the crystalline placode at this developmental stage (CP). (B) Photomicrograph of the retina of a p3 prolarva showing the absence of DCX immunoreactivity. Note DCX immunoreactivity in the brain (star) in the same section. (C) Retina of a gill cleft prolarva (p7) showing the primordium of the lens (L), ganglion cells (thick arrow), photoreceptors (arrow) and the retinal pigment epithelium with melanin granules (asterisk). (D) DCX immunoreactivity in cells of the outer (photoreceptors) and inner layers of the retina of a p7 prolarva. (E) Retina of a burrowing prolarva (p20) showing ganglion cells (thick arrow), bipolar cells (arrowheads) and photoreceptors (arrow). The retinal pigment epithelium contains abundant melanin granules. (F) Retina of a p20 prolarva showing DCX immunoreactivity in perikarya and outer segments of photoreceptors and in a few cells and fibers of the inner region. In all photomicrographs dorsal is up and medial is to the left. Scale bars: 25 μm.