Mouse SCF (Stem cell factor, steel factor, Kit ligand, C-kit-ligand) is a hematopoietic growth factor that stimulates the proliferation of bone marrow stem cells. SCF induces the proliferation of mast cells and primitive lymphoid and myeloid hematopoietic bone marrow progenitor cells in culture. SCF acts synergistically with both GM-CSF and G-CSF, IL-7 and EPO. Mouse SCF is active on human cells as well as murine cells and can be used for long term bone marrow culture.