Have you ever used lego? You have the bricks and you can make different objects by assembling them differently.
Cells in our body contain DNA. This DNA is like lego bricks for the cells. DNA is a big molecule that contains sections called genes. Different numbers and combinations of these genes make a cell look square or flat or sticky.
A stem cell is a cell that is able to turn into a different type of cell and it does this by changing the genes that it is using.
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