stem cells

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* specialised cells origionally came from stem cells 

* stem cells are unspecialised- so can develop into any kind of cell 

* all multicellular organisms have some form of stem cell 

* in humans stem cells are found in embryos and in adult bone marrow

* in bone marrow they are not as 'flexible' so can only develop into a limited rtange of cells 

* stem cells divide to become new cells- which them become specialised, when a cell becomes speicalised for its job it is called differentiation 

* in animals stemm cells are used to replace damaged cells 

* in plants stem cells (found in the cambium) are needed to make new shoots and roots. they can


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