11.   Researchers quickly deduced that cattle had gotten the disease from eating brains and nerve tissue of sheep infected with scrapie.

12.   The aim, researchers said, is to have nerve tissue grow to fill the cavity and prevent further damage.

13.   The agency began studying the new method after consumer groups complained that beef marrow, ground-up bones and nerve tissue were being passed off as meat.

14.   The main system, for the conscious detection of smells, involves a patch of nerve tissue high up in the nose.

15.   The nerve tissue that had been bent around the cyst did not simply spring back into place.

16.   With the chronic disorder, called syringomyelia, expanding holes develop in spinal cord nerve tissue near the injury, causing pain and progressive loss of sensation and movement.

17.   Brains, other organs and nerve tissue are considered especially dangerous from infected animals.

18.   Cheng underwent nearly six hours of surgery to reconnect muscle, bone, and nerve tissue.

19.   Earlier studies also failed to find prions in the meat of infected cattle, even though it was present in their brains and nerve tissue.

20.   Even if the retina, made of nerve tissue, can be reattached, there is no guarantee it will regain its function.