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Fig. 1. Autoregulation contributes to Krox20 expression in the neural crest. Heterozygous (A,C, Krox20+/lacZ) and compound mutant (B,D, Krox20Cre/lacZ) embryos were analysed for ß-galactosidase activity in toto at 9.0 (A,B) and 9.5 (C,D) dpc. Expression in the neural crest and rhombomeres 3 and 5 are indicated (arrowheads). Embryos are oriented with anterior to the right. NC, migrating neural crest.





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