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Fig. 13. Signaling patterns at blastula stage in manipulated embryos. (A-A''') controls; (B-B''') UV-irradiated embryos; (C-C''') LiCl-treated embryos; (D-D''') embryos ventrally injected with ß-catenin mRNAs (large arrowhead). (A-D,A''-D'') original images; (A'-D',A'''-D''') nuclear images. A-A'', B-B'' and C-C'' are from double stained sections. All other images are from contiguous sections from the same embryos. Arrows, arrowheads and asterisks: see explanations in the text.