Step 1 - Start with a human cell with the insulin gene in its DNA, Step 2 - Use an enzyme to cut out the insulin gene from the DNA, Step 3 - Then use a bacterium with a ring of DNA called a plasmid, Step 4 - Take out the plasmid from the bacterium, Step 5 - Use an enzyme to split the plasmid open, Step 6 - Insert the insulin gene into the plasmid using another enzyme, Step 7 - Plasmid with insulin gene in it is taken up by the bacterium, Step 8 - The bacterium then multiplies many times, Step 9 - The insulin gene is switched on and the bacteria produce insulin, Step 10 - The insulin is then harvested for human use,

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