When cells change to become ____ it is called ____. As cells change, they develop different ____. They turn into different types of cells, to carry out specific ____. Most differentiation occurs as an organism develops. Most animal cells can only ____ at an ____ stage of the animal’s life. But ____ cells can differentiate for the whole of the ____ life. The cells that differentiate in adult animals are mainly used for ____ and ____ cells. Some cells are undifferentiated — they are called ____ cells.

B1 Topic 1 Stem Cells

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