Scientists build the human insulin gene in a laboratory. Then they remove a loop of bacterial DNA known as a plasmid and insert the human insulin gene to the plasmid. Researchers return the plasmid to the bacteria and put the recombinant bacteria in large fermentation tanks. There, the recombinant bacteria use the gene to begin producing human insulin. Scientists harvest the insulin from the bacteria and purify the substance for use as a medicine for people. Hope that helps:)!!
