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Fig. 1. Identification of minimal cis-acting neural crest enhancer regions in the
proximal Pax3 genomic region. Constructs 1-10 used for the creation
of transgenic mice (not to scale, see Materials and methods for construct
details). Neural crest enhancer elements, NCE1 and NCE2, are in red. The Tead
binding site within NCE2 is indicated and the mutant version of this site used
in subsequent experiments is shown. The number of genotype positive E10.5-11.5
embryos obtained from injection of each construct is shown and those
expressing ß-galactosidase are indicated.