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Fig. 1 Expression of vegfaa and vegfbb genes in the adult zebrafish brain. In situ hybridization was performed on transverse sections through various brain regions, including the telencephalon (A1 and B1), the anterior (A2 and B2) and posterior parts (A3 and B3) of the preoptic area, and the anterior (A4 and B4), mediobasal (A5 and B5), and caudal (A6 and B6) hypothalamus. Both vegfaa and vegfbb transcripts were detected in the different brain subdivisions including the telencephalon, diencephalon and mesencephalon in the parenchyma and along the ventricular/periventricular layers. A1' to B6' correspond to higher magnification images taken at the level of the square and show gene expression in the ventricular and periventricular layers of the dorsomedian telencephalon (Dm), anterior (PPa) and posterior parts (PPp) of the preoptic area, the anterior part of the hypothalamus (Hv), the periventricular pretectal nucleus (PPp) and the subgranular grey zone of the optic tectum (TeO). Bars: 200 ?m (A1 to B3), 300 ?m (A4 to B6) and 50 ?m (A1? to B6?)