The cell source growth factor 1: tend to turn the factor CXCL12 to have tend of mightiness to the lymphoid cell to turn the function and rise the important function in the growth.The CXCL12 leading builds the blood stem cell in embryo develop from embryo's liver to the change residence of marrow. CXCL12 can expression in many tissues ( include the brain, thymus gland, heart, lung, liver, kidney, marrow, spleen). Chemokine_CXC: 1 of 4 subgroup designations based on the arrangement of the two N