Word: lymphoid
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Mouse cells divide only about twelve times before dying, chicken cells 25 times, human cells 50 times. That discovery could explain one important characteristic of aging: the inevitable deterioration of the body's immune system. As the years pass, the system's lymphoid cells, no longer able to proliferate in adequate numbers, lose their power to fight off invaders and sometimes even mistake the body's own tissue for foreign bugs. Thus the aged become increasingly vulnerable to diseases-from cold viruses to cancer...
...president-elect last week. Prior to implanting new kidneys in beagles, he has been removing some of their bone marrow-the site, along with the lymph nodes, of white-blood-cell production-and irradiating the dogs. The X rays destroy the ability of the remaining bone marrow and lymphoid tissue to produce white blood cells. Then he reinjects the marrow cells, thus restoring the animal's immune system, and quickly performs the transplant. Some of the beagles on which this technique has been tried have already survived for three years, without needing any immunosuppressive drugs...
...department, where it was fast-frozen with liquid nitrogen. A thin slice was cut, which a pathologist examined under a microscope. Within five minutes the message was relayed to Fouty: malignant cells. In a 2½-hour procedure, Fouty removed the entire right breast, its underlying pectoral muscle, and lymphoid tissue in the adjacent armpit. This tissue was also sent to pathology. Because it takes three or four days to process the lymphoid tissue for microscopic examination, it will not be known until later this week whether Betty Ford's cancer had already spread to some extent...
Another example of Good's intuitive flashes occured while he was working with Dr. Henry Kunkel at New York's Rockefeller University in 1950. Good observed lhat patients with different types of tumors suffered from different types of infections. Those with Hodgkin's disease, a cancer of the lymphoid system, were particularly susceptible to TB, fungus and viral infections; those with multiple myelomas, or cancers of the bone marrow, were vulnerable to such bacterial infections as streptococcus and pneumococcus. Subsequent observation and experiments at the University of Minnesota convinced Good that there were not one but two basic immune responses...
...equivalent of the bursa.) B-cells are called the agents of humoral immunity because they synthesize antibodies that circulate freely in the blood. The antibodies, actually globular proteins, help the body resist disease-causing organisms. Both the B-cells and T-cells reside primarily in the body's lymphoid tissues, which are found under the arms, in the groin, behind the ear, in the abdominal cavity and other locations. From these tissues, the cells recirculate through the body and continually monitor for the presence of potential attackers...