embryonic stem cells : give rise to any cell, found in embryos, donor would be an aborted or spare IVF embryo, can be used to treat Parkinson's disease or paralysis, can divide quickly in the body as the cell cycle is set for rapid growth, adult stem cells: give rise to limited types of cell, found in the body as soon as you are born, a donor would be a healthy person, is used to treat leukaemia, bone marrow stem cells is an example,

comparing stem cells

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