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Embryonic development in vitro. A-F: Embryos explanted at blastodisc stage (A) were cultured as described in the Experimental Procedures section and photographed. A: Blastodisc. B: Optic cup. C: Middle eyed embryo. D: Late-eyed embryo. E: Very late-eyed embryo. F: Mature embryo. Scale bar = 500 μm in A–E, 1mm in F, respectively.
