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The localization of Crb1, Crb2a, and Crb2b requires Nok in the diencephalon at 26-ss. A, C, E. Crb1, Crb2a, and Crb2b localized to the apical surface of the diencephalon (arrows) in wildtype embryos. B, D, F. Unlike in wildtype embryos, Crb1, Crb2a and Crb2b could not localize to the apical surface of the diencephalon in nokm520 mutants. R, retina; D, diencephalon. Scale bars, 50 ! m.
