The Translation of the <i>Xenopus</i> Homeobox <i>Xotx5b, Xvsx1,</i> and <i>Xotx2</i> mRNAs Parallels the Generation of Photoreceptors and Bipolar Cells

<p>In situ hybridization of <i>Xotx2, Xotx5b,</i> and <i>Xvsx1</i> mRNAs (Fast Red detection) compared to immunostaining of the corresponding proteins (green detection) on serial 10-μm sections of embryonic retinas at st. 34 (mid-neurogenesis), st. 37 (late-neurogenesis), and st. 42 (mature embryonic retina). Schematics show the retinal cell types present at the corresponding times of analysis (see also <a href="http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.0040272#pbio-0040272-sg002" target="_blank">Figure S2</a>). Dashed lines border the entire thickness of neural retinas (st. 34–37), or indicate the boundaries between different cell layers (st. 42, magnification of central retinal aspect); GCL: ganglion cell layer, INL: inner nuclear layer, ONL: outer nuclear layer.