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The corresponding gene, borne by a plasmid, circular bacterial DNA (as used to manufacture GMOs : genetically modified organisms )....
....is transfected (by a chemical or physical process) or transduced (by a virus).....
......or into Escherichia coli, a bacteria, if you need a non glycosylated (without added sugar) protein.....
HealthValue
....into a mammalian cell (such as a Chinese Hamster Ovary cell, CHO), able to  synthesize  glycoproteins (protein + sugar)....
....then the bacteria or mammalian cells are introduced into a fermentor (or bioreactor) , where the recombinant protein is produced
HOW TO MANUFACTURE
A RECOMBINANT PROTEIN