Non-metastasising variants selected from metastasising melanoma cells.
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Biomedical subjects
Publications and source records attributed to T W Tao.
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Morphology and growth characteristics of an osteosarcoma and a glioblastoma are described after direct transplantation in nude (thymusless) mice. In osteosarcoma neither characteristic had changed after 14 months' observation. In contrast, some of the glioblastoma transplants (22 months' observation) showed dedifferentiation of morphology and grew faster than others derived from the same biopsy. The possible reasons for the different growth pattern of the two tumors are discussed.
Lethally irradiated mice were reconstituted with bone marrow cells from 'nude' or normal mice. It was found that the radioprotective capacity of bone marrow cells from normal and thymusless 'nude' mice is similar and that the immune responses to sheep red cells in radiation chimeras reconstituted with normal and nude bone marrow cells are also similar. Bone marrow cells from nude mice, in spite of the lack of the thymus, develop into hematopoietic cells and contain also T-precursor cells.
The primary and secondary responses to phiX174 have been studied in T cell-deprived (T- minus) and control CBA mice including sham-operated (T+) and normal mice. The effect of pertussis on the immune response of these mice has been measured. It is concluded that: (1) the gammaG and memory responses to phiX are produced in T- minus mice even though greatly reduced in comparison with T+ and normal mice; (2) pertussis appears to enhance the gammaG response in T- minus mice while suppressing it in T+ and normal mice.
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Organ cultures of lymph nodes obtained from nonimmunized rabbits were incubated with bacteriophage d, X174; as a result, 19S antibody was produced first, and then 7S antibody. Differences between this response and the secondary response to d? X174 induced in vitro suggest that the foriiier is a primary response.
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