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. 2014 Aug 28;5:28. doi: 10.1186/2041-9139-5-28

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Copyright © 2014 Ma et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 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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sox2 expression is downregulated in the lens during cavefish development. (A) Semiquantitative RT-PCR showing reduced sox2 mRNA levels in cavefish relative to surface fish embryos. (B-O)In situ hybridization shows sox2 expression during surface fish (B-E, J, L, N) and cavefish (F-I, K, M, O) development. B-I Tailbud (B, D, F, H) and 5-somite (C, E, G, I) stages viewed from the lateral (B, C, F, G) or rostral (D, E, H, I) sides. Scale bar in B is 250 μm; magnification is the same in B-I. (J-O)sox2 downregulation in the cavefish lens at 42 hr post fertilization (hpf). N and O are sections through the eye region of the embryos shown in J-M. Dashed lines indicate the eye and lens. R: retina. CMZ: ciliary marginal zone. Scale bar in J, L and N is 100 μm; magnification is the same in J, K; L, M; and N, O.