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Extreme anterior domain (EAD) gene expression domains in Xenopus. Frontal views of Xenopus tadpole embryos. Selected gene expression domains are shown that include the EAD. These include pitx1c, pitx2, pitx3, vgl2, xanf1, cpn, frzb1, shh, fgf8, and raldh2. See text for details on their function in mouth development.
