stem cells

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  • stem cells
    • undifferentiate-d cell of an organism
    • divides to form more cells of the same type; mitosis
    • can differentiate to form many other types of cells
    • human embryonic stem cells
      • can be cloned and made to differentiate into most cells
      • therapeutic cloning uses same genes so the body doesn't reject the tissue
        • risk of infection
    • adult bone marrow stem cells
      • can form many types of human cells e.g. blood cells
      • tissue is matched to avoid rejection
      • risk of infection
      • only few types of cells can be formed
    • meristems (plants)
      • can differentiate into any plant cell type throughout the life of the plant
      • used to produce clones quickly and economically
        • e.g. rare species, disease resistance

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