we have found that suppressor t cells already induced by p815 in syngeneic late tbh are sensitive to low doses of cyclophosphamide ( 50 mg/kg ) given 1 day before spleen harvest , but the in vitro ctl response of late tbh spleen cells could not be restored by pretreating the mice with cyclophosphamide , even when exogenous interleukin-2 was added to the cultures .
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of