Objective To investigate the soluble CD40 ligand(sCD40L),soluble Fas ligand(sFasL) and flt-3 ligand(FL) in pathogenesis of aplastic anemia(AA) and its clinical significance.Method Elisa assay was employed to determine the levels of sCD40L,sFasL and FL in peripheral blood and bone marrow of 34 AA patients.Color immunofluorescence assay and flow cytometry analysis were used to trace the T cell subsets and membrane molecules.The effects of T cells on colony forming unit-granulocyte-macrophage(CFU-GM) was mea...