Fibroblasts are mesenchymal cells, which they derived from the embryonic mesoderm. Although cells loosely called fibroblasts have been isolated from many tissues and assumed to be connective tissue cells, fibroblasts appear to be the least specialized cells. There is good evidence that fibroblasts in different parts of the body are intrinsically different. Fibroblasts secrete a nonrigid extracellular matrix that is rich in type I and/or type III collagen. Fibroblasts are the easiest of cells to grow in culture-a feature that has made them a favorite subject for cell biological studies.HCPF from AcceGen Biotech Research Laboratories are isolated from human choroid pluxus. HCPF are cryopreserved at primary culture and delivered frozen. Each vial contains >5 x 10^5 cells in 1 ml volume. HCPF are characterized by immunofluorescent method with antibody to fibronectin. HCPF are negative for HIV-1, HBV, HCV, mycoplasma, bacteria, yeast and fungi. HCPF are guaranteed to further expand for 15 population doublings in the condition provided by AcceGen Biotech Research Laboratories.