Planaria are freshwater flatworms that have become a key model for studying regeneration and stem cells, as they can regenerate any part of the body, even the head. But how does the animal know what part of its body is missing and what kind of tissue it needs to regenerate?
https://www.lifetechnology.com/blogs/life-technology-science-news/researchers-identify-new-molecular-mechanism-key-to-planarian-regeneration
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