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Fig. 1 Different developmental timing for zebrafish and medaka. Images of zebrafish (left) and medaka (right) embryos synchronised at the blastula stage (top, 512 cells, t=0) and at different stages of embryonic development (hours post blastula, hpb). Eye cups (asterisks) are evident in zebrafish by 19 hpb and retinal pigmentation (and neurogenesis) (arrows) by 26 hpb; in medaka, retinal pigmentation does not start before 48 hpb. Scale bars: 200 µm.
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