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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.