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Fig. 4 Expression of the paralogous AMPA receptor subunit genes gria4a and gria4b in zebrafish at 24, 48, and 72 hours postfertilization (hpf). A,A′: gria4a expression at 24 hpf (A: lateral view; A′: frontal view). B,C: The expression pattern of gria4a at 48 hpf (B: lateral view; C: dorsal view). D,E: Expression of gria4a in the central nervous system (CNS) of a 72 hpf zebrafish larvae (D: lateral view; E: dorsal view). F-L: The 20-μm-thick Vibratome sections cut frontally through a gria4a hybridized zebrafish larvae at 72 hpf. M-M″: gria4b gene expression pattern in a 24 hpf embryo (M: lateral view; M′: frontal view; M″: dorsal view with focus on hindbrain and spinal cord). N,O: Expression of gria4b in the CNS of 48 hpf zebrafish embryos (N: lateral view; O: dorsal view). P,Q: gria4b expression in a 72 hpf zebrafish larvae (P: lateral view; Q: dorsal view). R-W: Frontal, 20-μm-thick Vibratome sections performed through a gria4b hybridized zebrafish larvae at 72 hpf. For abbreviations, see Figures 1-3.