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Fig. 2. Incisor germ transplantation. To observe the growth of the mutant
incisors, we implanted the apical regions of mutant incisors under kidney
capsules. Because a tooth germ is too large to implant under a kidney capsule,
we separated the region surrounding the apical end from the tooth germ and
implanted only the apical end. After 3 weeks of incubation, we removed the
implants.