How are transgenic animals used to treat emphysema?

Emphysema:

1. A form of chronic obstructive pulmonary illness called emphysema causes the lungs' air sacs to swell and eventually become destroyed.
2. As a result, a chronic illness develops that causes coughing and breathing problems.
3. By introducing the portion of DNA that codes for a particular biological product, such as the human protein (-1-antitrypsin) used to cure emphysema, transgenic animals might make useful biological products.
4. By introducing the section of DNA that codes for a specific product, such as human proteins, transgenic animals that produce useful biological products can be produced.