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A.

B.

C.

Figure 5. Anterior region of zebrafish embryos approximately 70 hours after treatment with retinoic acid. No apparent abnormalities are seen in the embryos in the 10-11 M (B) and 10-10 M (C) solutions when compared with the control (A). Eye, otic vessicle, and somite development appear very similar. The heads of the embryos treated with 10-11 M (B) and 10-10 M (C) solutions appear to be slanted backwards.

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