1.   Because there is no sure way of sterilizing instruments contaminated with prions, the discovery prompted calls for surgeons to use disposable instruments for operations involving lymph tissue.

2.   Importing foreign animal products derived from brain spinal cord or lymph tissues is strictly barred.

3.   The brains, spinal cords and lymph tissues of the diseased livestock showed that they were all infected by the same particles Prusiner had named prions.

4.   The lymph tissue is one of the key areas in the body where the virus could hide.

5.   The most precise tests detect no HIV in his blood and only trace amounts in his lymph tissue, the major reservoir for the virus.

6.   Endothelial cells line veins, arteries and lymph tissue.

7.   Ho reported that he and his colleagues have discovered tiny, dogged traces of virus in bits of lymph tissues, the very heart of the immune system.

8.   Two possible diagnoses were a tumor in the abdomen area or lymphoma, a cancer of lymph tissue, Mulder said.

9.   Two possibilities were a tumor in the abdomen area or lymphoma, a cancer of lymph tissue, Mulder said.