A video of regeneration in axolotls:https://www.youtube.com/watch?v=Eo50ctoOTWs
The photography in this video is excellent, but the commentary is seriously wrong. Axolotls are not the only neotenic amphibian. Although cartilage, muscle, and other cell types in the stump of the cut limb become indistinguishable, "dedifferentiating" back to what looks like their early embryonic state, all are replaced by descendants of the same kinds of the cells in the stump of the cut limb. They do NOT become truly undifferentiated stem cells as is stated in this video.
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