based on the macrophage-specific release using crystalline silica , and the production and secretion of at least three hemopoietic regulatory factors ( erythropoietin , colony stimulating factor and a multipotential stem cell enhancing and maintaining factor ) into the extracellular fluid of bone marrow-derived macrophages grown on hydrophobic teflon foils , a hypothesis for the regulation of hemopoiesis is proposed .
C0014822
erythropoietin
C0009392
colony stimulating factor