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When researchers wish to obtain recombinant proteins, a primary choice of the method is in most cases the expression in E. coli. If this system does not work for the protein of interest, they may turn to insect or mammalian cells. Protein expression in vitro may be chosen if these in vivo expression systems do not give the protein satisfactorily. There are several reasons why expression of some recombinant proteins in living cells is poor. If the protein to be expressed is toxic to host cells or inhibitory for growth, it should be difficult to express the protein to a high level. The cell-free system is derived from the extract from broken cells, and therefore the above-mentioned problems that occur in the living cells, if not all, are avoidable.

Protein Synthesis in vitro: Cell-Free Systems Derived from Human Cells