21.   The radiation that causes leukemia, gamma rays and X-rays, passes through the body and reaches the marrow, damaging cells and giving rise to disease.

22.   These radon byproducts produce high-energy radiation, called alpha particles, that can damage lung cells, leading to cancer.

23.   They also found evidence that Herceptin combined with a common class of chemotherapy drugs can damage heart cells.

24.   This buildup seems to damage brain cells from the outside.

25.   This clustering seals tears at a cellular level and fuses damaged cells together.

26.   This, he says, could prevent the radicals from damaging cells and shutting down vital bodily functions, such as the production of blood cells in bone marrow.

27.   Tobacco smoke damages the cells that line the tubes of the lungs, called the bronchi, switching on a cancer-causing gene that is normally repressed.

28.   When cells are damaged by free radicals, dangerous chemicals generated by ordinary metabolism, the protein triggers a self-destruct mechanism that forces the stricken cell to commit suicide.

29.   Plastic bags retain moisture, which could damage cells of human tissue containing DNA genetic material.

30.   Almost all nuts are high in Vitamin E, an antioxidant that neutralizes compounds that damage living cells.