11.   Normal colonic tissue and tissues from inflammatory bowel disease and colorectal tumours were obtained from the department of surgery at our university.

12.   Another appears to protect normal tissue against the effects of radiotherapy, making it possible to apply higher cancer-killing doses to tumours.

13.   A new technique is making it possible to deliver higher doses of radiation to the prostate while sparing normal tissues.

14.   But instead of warding off pathogens, such as bacteria or viruses, the cells mistakenly attack normal tissue and cells in the body.

15.   Cirrhosis is a chronic disease of the liver in which fibrous tissue invades and replaces normal tissue, disrupting important body functions such as digestion and detoxification.

16.   Effective immune systems must respond quickly to invading organisms, such as viruses or bacteria, while not attacking normal tissues of the host organism.

17.   Folkman has spent his career trying to prove that blocking angiogenesis could turn out to be an ideal therapy for attacking malignant tumors while leaving normal tissues intact.

18.   In previous papers, scientists have shown telomerase to be active in many types of cancers but not in most normal tissues.

19.   It did keep them from forming normal embryonic tissues, leaving them as large, yolk-filled cell masses.

20.   Most experts believe the syndrome represents an autoimmune attack in which antibodies in the blood mistakenly attach themselves to normal tissue and destroy it.