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Figure Caption
Fig. S1 casanova mutants, lacking endoderm, do not express egr1 at 48 hpf. Single in situ hybridization for egr1 in casanova mutants. Lateral (A,B) and dorsal (C,D) views, anterior to the left. Scale bars 100 μm. (A,C) Wild-type or heterozygous cas+/- express egr1 in the pharyngeal endoderm (pe). (B,D) Homozygous cas-/- do not express egr1 in the pharyngeal region, but in the pectoral fins and in the two hearts of cas-/- embryos. Pectoral fin (pf), heart (h).
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