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<big><center>[[Reproductive_System#Reproductive_Technologies|'''BACK TO REPRODUCTIVE TECHNOLOGIES''']]</center></big>
 
<big><center>[[Reproductive_System#Reproductive_Technologies|'''BACK TO REPRODUCTIVE TECHNOLOGIES''']]</center></big>
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* Commonly used in mice to propagate required characteristics.
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* '''Embryonic stem cells''' are used as a source of '''totipotent nuclei''', which are capable of dividing into a range of new cells.
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* These cells are fused with pre-ovulatory oocytes which have had their own haploid nucleus removed using electrofusion.
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* Cells are artificially stimulated to the second meiotic division and begin embryonic development.
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* The cell source ,capable of replication in culture, can be stored by freezing and is therefore 'immortal' and able to produce many identical individuals.
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* Cloned individuals have a high percentage of developmental abnormalities.
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** Often associated with Arthritis and Joint problems.
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