we have previously shown that after intravenous ( i.v . ) immunization of mice with allogeneic spleen cells , two populations of suppressor t ( ts ) cells may occur that can suppress delayed-type hypersensitivity ( dth ) to alloantigens : ts effector cells that transiently occur in the spleen , and long-lived , recirculating ts cells that occur in thoracic duct lymph and can be transferred by parabiosis .
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allogeneic
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cells