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. 2014 Jan 8;11:1. doi: 10.1186/1742-9994-11-1

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Copyright © 2014 Wucherer and Michiels; 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/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 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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Change in fluorescence spectrum after application of KCl. Micrographs of a section through the iris under bright field (A), bright field and fluorescence (B), fluorescence (C) and polarized light (D), showing that the fluorescence emanates from the stratum argenteum, a layer of iridophores with guanine crystals (see D compared to B and C) (labelling in accordance with [37], p. 47). This layer is invaded by finger-like extensions of melanophores at the posterior side of the stratum argenteum (dark). The anterior (outward facing) side is at the top.