Fig. 4
From: Ciliary photoreceptors in sea urchin larvae indicate pan-deuterostome cell type conservation
Time course of regulatory gene expression during photoreceptor development. Embryos were stained by WMISH with probes detecting the expression of regulatory genes for which expression was observed in larval photoreceptor cells at 60 and/or 72 h. Developmental stages from pregastrula (24 h) to pluteus larva (72 h) are indicated. OV, oral view; RLV, right lateral view. Scale bars 20 μm