aldh1a3 expression in adenohypophysis and swim bladder. Expression of aldh1a3 (A, C–E) and pomca (B) was detected by whole mount in situ hybridisation in the zebrafish pituitary and swim bladder at 96 hpf. Comparison to pomca expression in the pituitary (pi) and the hypophyseal neurons (hn) (B, dorsal view) suggests that aldh1a3 is expressed in anterior lobe of the hypophysis (A, dorsal view, C, mid-sagittal section, anterior to the left). A further expression domain of aldh1a3 exists in the swim bladder (sb) (D, lateral view; E, ventral view). Scale bars, 100 μm.