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Frs2α2F/2F mice exhibit defective lens and retina induction. Immunofluorescence labeling for Pax6 (A–D) and Chx10 (E–H) of eye-region cryosections from mice of the indicated ages and genotypes. lpl, lens placode; ov, optic vesicle; ple, presumptive lens ectoderm; lp, lens pit; pr, presumptive retina.
