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This picture is a pseudocolored image of an embryonic day 7 chicken retina. The retina has been subjected to in situ hybridization to
visualize cells which express chicken achaete-scute homolog-1 (CASH-1). Clusters of CASH-1-expressing cells, shown in red, are periodically distributed in the central, more mature region of the
retina, shown at the bottom. Clusters contain fewer CASH-1-expressio cells and are less well organized moving away from this area. Chris Jasoni
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