11.   The findings indicated that cyclosporine promotes the production of a natural protein called transforming growth factor beta, already a suspect in cancer growth.

12.   The goal is to find a natural human protein that will multiply blood-forming stem cells that have been isolated from the bone marrow.

13.   Wheat gluten is the natural protein portion of the grain.

14.   Interferon is a natural protein that strengthens the natural defenses of a cell against an aggressor.

15.   And plants such as cotton or potato have been genetically engineered to contain a natural protein from a bacterium which is toxic to some pests.