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Fig. S1 (A–B) Expression of endodermal marker foxa2 as detected by WISH. (A,B) Lateral view of foxa2 expression along the gut and swimbladder epithelium at 48 hpf (A) and 60 hpf (B). (C) Cross section of a 72-hpf embryo to show foxa2 expression in epithelium (e) of swimbladder. Abbreviations: e, epithelium; g, gut; m, mesenchyme; n, notochord; pd, pneumatic duct; oe, oesophagus; ph, pharynx; sb, swimbladder. Scale bars: 250 μm.
                
                    
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                        Acknowledgments
                    
                    
                
                
            
        
        
    
        
            
            
                
                    
                        
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    Reprinted from Developmental Biology, 331(2), Winata, C.L., Korzh, S., Kondrychyn, I., Zheng, W., Korzh, V., and Gong, Z., Development of zebrafish swimbladder: the requirement of Hedgehog signaling in specification and organization of the three tissue layers, 222-236, Copyright (2009) with permission from Elsevier. Full text @ Dev. Biol.