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Dwarf yellow-headed gecko with regenerating tail

A Sun flower starfish regenerates its arms

Regeneration means that an organism regrows a lost part, so that the original function is restored. It is a term in developmental biology.

The ability to regenerate differs in different groups. Whereas newts, for example, can regenerate severed limbs, mammals cannot. Limb regeneration in newts occurs in two major steps, first de-differentiation of adult cells into a stem cell state similar to embryonic cells and second, development of these cells into new tissue more or less the same way it developed the first time.