In Vitro Sensitivity of Transplantable Leukemias to Endogenous Granuloid (GCE, GI–2) and Lymphoid (T4, T4–1) Inhibitors of Proliferation

The effect on cell proliferation of crude granulocyte and thymocyte extracts (GCE, T4) and of their target-specific fractions (Gl-2, T4-1) was studied in cultures with transplant