Gene expression domains of zebrafish khdrbs2 and khdrbs3 genes in brain detected by WISH and cryosection. Transverse sections of brain structures: telencephalon (A,E,I,A′,E′,I′), diencephalon (B,F,J,B′,F′,J′), midbrain (C,G,K,C′,G′,K′), and hindbrain (D,H,L,D′,H′,L′). Straight lines, representing slice positions, are marked by English letters corresponding to the section images. Expression sites are labeled with abbreviation as follows. ep, epiphysis; hy, hypothalamus; tec, tectum; teg, tegmentum; tel, telencephalon.