Stem cells
Why?
Stem cells are unspecialised cells that can divide and turn into many different kinds of cell.
One stem cell divides and its daughters turn into a red blood cell, a nerve cell and a muscle cell.
Press the button to watch a stem cell become different cells, then see a flatworm regrow.
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A cut flatworm regrows its whole head because stem cells all over its body become the missing cells.
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