Loss of Fgf signaling results in fewer parapineal cells. (A,B) Dorsal views of WT and fgf8ax15 mutant zebrafish embryos labeled with gfi-1.2 (parapineal cells; black arrowheads). (C,D) Dorsal views showing expression of gfi-1.2 (black arrowheads) in WT larvae at 52 hpf that were treated between 24 and 30 hpf with either DMSO or SU5402. In A-D, dashed line encircles the pineal complex anlage. (E) fgf8ax15 mutants displayed a significant reduction in parapineal cell number compared with WT (***P=<0.0005 by t-test). (F) Reductions in parapineal cell numbers were observed in embryos treated with SU5402, particularly for 18-24 hpf and 24-30 hpf treatments (***P<0.0005 by t-test). Error bars represent s.e.m. Scale bar: 25 μm.
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