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A. B.

C. D.

Figure 2. Anterior region of zebrafish embryos 24 hours after treatment with retinoic acid solutions. Eyes develop normally in the control embryos (A), and no apparent abnormalities are found in the embryos treated with 10-11 M (B) and 10-10 M (C) solutions. Embryos in the 10-8 M (D) solution did not develop eyes.

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