This antibody reacts with the CD8-antigen (T8-antigen),which is expressed on human T lymphocytes. The monoclonal antibody reacts with 20-30% of human peripheral T lymphocytes. The monoclonal antibody reacts with T lymphocytes with suppressor-cell activity in pokeweed mitogen- stimulated immunoglobulin production, as was shown in separation experiments (i.e. "panning"). The monoclonal antiody does not react with B-cells, monocytes, granulocytes and platelets.