In organisms like bacteria and other microbes, or even in higher plants, the uptake of genes by cells is often described by the term 'transformation'. However in animals this term has been replaced by the term 'transfection', because the term 'transformation' in animal cell culture is used to describe phenotypic alteration of cells.
The usage of the term 'transformation' for 'cell alteration' has been unfortunate and discontinuation of its usage for this purpose is suggested.
Transfection or gene transfer in animals may be carried out at the cellular level to get transfected cells, which may be used for a variety of purposes such as production of chemicals and pharmaceutical drugs.
It may also be undertaken for basic studies involving study of structure 'and function of genes. Although many mammalian cell lines have been regularly utilized for these purposes, transfection has also been achieved successfully for the production of transgenic animals.
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