cdx Genes Regulate the Expression Boundaries of raldh2 and cyp26a1. (A) Expression of raldh2 and cyp26a1 in wild-type, cdx4–/– mutants, and cdx-deficient embryos by whole-mount in situ hybridization. Brackets indicate raldh2 and cyp26a1 expression domains in the anterior paraxial mesoderm of 5 somite stage embryos. Right column is an overlay of the raldh2 and cyp26a1 expression patterns, arrows indicate the anterior boundary of the presumptive RA source. (B) Double whole-mount in situ hybridization showing co-staining of krox20, myoD, raldh2, and cyp26a1 at 10 somites in wild-type, cdx4–/– mutants, and cdx-deficient embryos (gene names are color-coded to match their staining product). Brackets and numbers indicate raldh2 and cyp26a1 expression domains and somite position, respectively.
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