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Fig. S3 Transient expression driven by the 250-bp promoter in cldnb:gfp embryos (A) and in cldnb:gfp embryos injected with esr1 mRNA (B). A dozen cells are strongly fluorescent in A (arrows), and another 15 are more weakly fluorescent, as observed in half of the injected embryos. No cells are fluorescent in B, as observed in 85% of the injected embryos (see main text). Note the ectopic course of the primordium revealed by the nerve that follows primordium migration (arrowheads): the primordium first followed a normal course; then doubled dorsally and eventually U-turned to dive ventrally.
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Full text @ Proc. Natl. Acad. Sci. USA