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Background
Urodele amphibians are capable of regenerating their organs after severe damage. During such regeneration, participating cells are given differentiation instructions by the surrounding cells. Limb regeneration has been investigated as a representative phenomenon of organ regeneration. Cells known as blastema cells are induced after limb amputation. In this process, dermal fibroblasts are...
The Xenopus adult limb has very limited regeneration ability, and only a simple cartilaginous spike structure without digits is formed after limb amputation. We found that expression of Shh and its downstream genes is absent from the regenerating blastema of the Xenopus froglet limb. Moreover, we found that a limb enhancer region of the Shh gene is highly methylated in the froglet, although the sequence...
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