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Epithelial-specific Pitx1-Cre transgenic mice. X-gal staining (blue) of Cre activities of the Pitx1/Cre and R26RlacZ double heterozygous embryos. A–C: Whole-mount staining. D,E: Middle sagittal sections. Arrowheads point to the caudal limits of Cre activity; asterisk, ventral nasal placode; fnp, frontal nasal prominence; lnp, lateral nasal prominence; md, mandible prominence; mnp, medial nasal prominence; mx, madillary prominence; p, pituitary; pl, palate; t, tongue.
