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- W1993313479 abstract "Mice were immunized for contact sensitivity and antibody production by painting the skin with picryl chloride. Lymph node and spleen cells taken 4 days later transferred contact sensitivity. However, cells taken at 7–8 days failed to transfer but were able to block the transfer by 4 day immune cells. These suppressor cells occurred in the regional lymph nodes, spleen and thymus. The suppressor activity of lymph node and spleen cells was due to B cells as shown by the effect of anti-θ serum and complement, nylon wool filtration and separation of EAC positive and negative cells by centrifugation on a discontinuous gradient. The transfer of fractions rich or poor in macrophages showed that the suppressor cell in the transferred population was not a macrophage. Separation using EAC rosettes suggested that B cells were responsible for the suppressor activity in the thymus. T cells isolated from the lymph nodes and spleen 7–8 days after immunization transferred contact sensitivity although the initial population was inactive. This indicates that passive transfer cells are present in the regional lymph nodes and spleen at later times after immunization but cannot be demonstrated because of the presence of suppressor B cells. However, no passive transfer cells were found in the thymus. The production of B suppressor cells required little or no T cell help and following immunization the spleens of reconstituted (B) mice were at least as active as control cells in causing suppression. There are several different suppressor cells which act in the picryl system and the B suppressor cells in immunized mice described here are distinct from the T suppressor cells in mice injected with picryl sulphonic acid." @default.
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- W1993313479 date "1976-08-01" @default.
- W1993313479 modified "2023-09-26" @default.
- W1993313479 title "Contact sensitivity to picryl chloride: The occurrence of B suppressor cells in the lymph nodes and spleen of immunized mice" @default.
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- W1993313479 doi "https://doi.org/10.1016/0008-8749(76)90117-9" @default.
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