5.20B understand how cloned transgenic animals can be used to produce human proteins

1. Researchers have managed to get cows and sheep to produce useful human proteins in their milk by transferring human genes into the cells of these animals.
- they can produce human antibodies that can be used in therapy for illnesses like arthritis, some types of cancer and multiply sclerosis.

2. Transgenic chickens have also been engineered to produce human proteins in egg white.
- these transgenic animals are then cloned so the useful genetic characteristic is passed on. Simply breeding does not always pass the genes onto their offspring.