(a) Symmetric expression of the ano2 gene delineates the boundaries of the dorsal habenular nuclei, whereas (b) aoc1 (Amo et al., 2010) and (c, d) mbnl3 transcripts localize to the ventral habenular nuclei. (e, f) Symmetric expression of gng8 encompasses the entire dorsal habenulae, and is found in a subset of cells in the ventral nucleus (arrowheads). (g) The kctd12.1 and (i,) kctd8 genes show predominant expression in the left or right side, respectively (Gamse et al., 2005), which is confined within the boundaries of the dorsal nuclei (h, j). (k)
kctd12.2 transcripts are more abundant in the right dorsal nucleus (Gamse et al., 2005), and (l) also found bilaterally in the ventral nuclei (arrowheads). All larvae are 4 dpf.