11.   With too much of the protein, those cells multiply faster than they should and cause cancer tumors to grow to dangerous levels.

12.   A team of American and Italian researchers demonstrated last year that heart muscle cells multiply after a heart attack.

13.   Although the cells multiplied by the millions, they could not be transplanted because in the body they would be like a cancer, growing out of control.

14.   When tests showed the cancer cells were multiplying, she was prescribed thalidomide.

15.   But a defective ribonuclease L can lose this ability, thus allowing cancerous cells to multiply.

16.   But an inherited defective ribonuclease L can lose this ability, thus allowing cancerous cells to multiply.

17.   Leukemia is a cancer of the blood in which infection-killing white-blood cells multiply at an uncontrolled rate, eventually killing the patient.