Explain the advantages of using recombinant DNA technology to produce human proteins in transgenic ...

Before the development of biotechnology, therapeutic proteins such as insulin, growth hormone, and blood-clotting factors were isolated from many sources, including animals in slaughterhouses, donated human blood, and even human cadavers. In some cases, contamination from these sources exposed people to serious and potentially fatal risks. For example, in the early 1980s, donated blood was not tested for HIV, and as a result, about 60 of all hemophiliacs became infected with HIV from contaminated clotting factor prepared from pooled blood donations. Hemophiliacs who received the serum-concentrated clotting factor also faced a risk of hepatitis infection.