fgf8ax15 mutants have a selective increase in cone photoreceptor number compared with WT larvae. (A) Schematic of the pineal complex of the larval zebrafish at 52 hpf. (B-E) Dorsal (B,C) and frontal (D,E) views of WT and fgf8ax15 mutants labeled with foxd3:GFP (pineal complex) and Arr3a (cone photoreceptors) at 52 hpf. fgf8ax15 mutants lack a distinct parapineal organ compared with WT (white arrowheads). L, left; R, right. (F,G) fgf8ax15 and WT embryos have equivalent numbers of foxd3:GFP expressing cells (F), projection neurons (HuC/D) and rod photoreceptors (Opsin1) (G). However, fgf8ax15 mutants have more cone photoreceptors (Arr3a) in the pineal complex than WT (G) (**P<0.005 by t-test). Error bars represent s.e.m. Scale bar: 25 μm.
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