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Fig. 7. Expression of elavl3 (A, three-somite stage) and neurog1 (C, one-somite stage) in wild-type embryos is compared with the expression of the same genes in embryos that had been injected with her3eng (B) or her3VP16 mRNA (D). Whereas the injection of her3eng mRNA leads to loss of primary neurones, her3VP16 causes ectopic activation of neurog1.