Fig. 4. Schematic of epithelial transplantation experiments. (A) Diastema epithelium harvested from the mandible of E11.5 ROSA-26 mice and transplanted unilaterally onto E12.5 wild-type early bud stage incisors. (B) Tongue epithelium harvested from ROSA-26 mice and transplanted unilaterally onto E12.5 wild-type incisors in control experiments. x-y demonstrates the plane of section through incisor regions.