Bioinformatics/Sequence Treatment/Gene Transfer
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the most commen methods of gene introduction to produce a artiffically modifed organism depend on the species in question.
in plant organisms (such as agro crops like wheat) the most common methods are the 'gene gun' or agrobacterium, the later of which is now more commen. in animal organism retrovial is most commen.
Micro-injection and and Engineered embryonic stem cell implantation are also used.
[edit] References
http://en.wikipedia.org/wiki/Gene_gun http://en.wikipedia.org/wiki/Agrobacterium http://en.wikipedia.org/wiki/Retrovirus http://en.wikipedia.org/wiki/The_Double_Helix