In medicine, genetic engineering (GE) is used to make biopharmaceutical drugs. Various organisms are engineered for use as factories to produce the drug product. Bacteria are the preferred option, as they are the easiest to grow and scale-up for production, but depending on the complexity of the drug’s molecular structure, other organisms such as yeasts, mammalian cells, etc., can also be used to express the drug product. The first GE drug approved for use was insulin. By the year 2000, there were over 100 GE drugs on the market. Currently, people’s lives are changed every day by drugs like Remicade, Epo, Avastin, and Neulasta.