Fig. 5From: Ciliary photoreceptors in sea urchin larvae indicate pan-deuterostome cell type conservationDevelopmental spatial expression of PSED regulatory genes. Images of embryos stained by WMISH for expression of four members of the retinal determination network at indicated developmental stages. Co-expression was observed in the hydropore canal but not in photoreceptor cells. HC, hydropore canal; LLV, left lateral view; OV, oral view. Scale bars 20 μmBack to article page