HSF from Creative Bioarray are isolated from human spleen tissue. HSF are cryopreserved at primary culture and delivered frozen. Each vial contains >5 x 10^5 cells in 1 ml volume. HSF are characterized by their spindle morphology and immunofluorescent method with antibody to fibronectin. HSF are negative for HIV-1, HBV, HCV, mycoplasma, bacteria, yeast and fungi. HSF are guaranteed to further expand for 15 population doublings at the condition provided byCreative Bioarray.