Regeneration is the process by which some organisms can repair or regrow parts of their body that are damaged or lost. It involves cells dividing and forming new tissue to replace what is missing. For example, starfish can regrow lost arms, and some lizards can regrow tails. In humans, regeneration is more limited, but skin cells can regenerate to heal cuts, and liver tissue can repair itself after damage. Studying regeneration helps scientists understand how cells and tissues repair themselves.
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