HTTP://WWW.NLM.NIH.GOV/MEDLINEPLUS/CLONING.HTML

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http://plato.stanford.edu/entries/cloning/#Oth

http://www.ornl.gov/sci/techresources/Human_Genome/elsi/cloning.shtml

http://learn.genetics.utah.edu/content/tech/cloning/whatiscloning/

http://cellsalive.com/