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MPPS stimulation of human lymphocytes is characterized by a 2-way cooperation phenomenon, i.e., T help of B cells and B help of T cells. In this system suppressor cells are generated after 6 days of culture. They were characterized as Ia- T cells. Their suppressor activity affected both T and B cell stimulation, and it may involve 2 different mechanisms: direct cell suppression, and interaction with soluble helper factors.
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Piccolella et al. (1981) studied this question.
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