An Apparent Lack of HLA Restriction in the Stimulation of Granulocyte‐Macrophage Colony Formation from Normal Human Null Cells by Helper T Lymphocytes

Haemopoietic progenitor cells capable of producing granulocyte-macrophage (GM) colonies have been demonstrated in the 'null' lymphocyte population of normal peripheral blood. The helper and suppressor roles of different T cell subpopulations have been implicated in the regulation of granulopoiesis in disease as well as in normal individuals. However, it is not certain whether such interactions between T cells and progenitor cells are …