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Fig. 4 Photomicrographs of sturgeon (td204e) (A,B) and hoover (C,D) mutant larvae in which Meckel’s (first arch) is fused with the palatoquadrate. Lateral (A,C) and ventral (B,D) views of stained sturgeon and hoover larvae reveal that the ceratohyal is fused to the hyosymplectic as well. Additional unidentified pieces of cartilage occur in the vicinity of the basihyal and caudal to Meckel’s (A,B,D, arrows). In hoover mutant larvae the ceratohyal cartilage is sometimes divided into two pieces (D). Scale bar, 100 μm.
                
                    
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                        Acknowledgments
                    
                    
                
                
            
        
        
    
        
            
            
                
                    
                        
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