Figure 1

Figure 1

Comparison of expression patterns of tac1 mRNA in the forebrain regions of male (A−D) and female (A’−D’) zebrafish. In the top panel, a schematic drawing of an adult zebrafish brain (lateral view) showing levels of cross-sections presenting in Figures 1−3. Alphabets represent respective figure numbers (A−D: Figure 1, E−H: Figure 2, and I−L: Figure 3). In the most-right panels (A”−D”), a schematic drawing of half of the brain section (left side) processed for tac1 staining indicating major brain structures at this level. There was a sexually dimorphic expression of tac1 in the anterior part of the parvocellular preoptic nucleus (A, A’), posterior part of the parvocellular preoptic nucleus (B, B’), and suprachiasmatic nucleus (C, C’). In contrast, no sexually dimorphic expression of tac1 was observed in the dorsal habenula (C, C’) and the ventral region of the periventricular hypothalamus (D, D’). Scale bars: (A–C), (A’–C’), 100 µm; (D, D’), 200 µm. See Glossary for abbreviation.