Description_x000D_ Application_x000D_ Transferrin is the primary iron binding and cell delivery molecule present in serum. Serum-free cell culture systems require a delivery format for iron. Transferrin is the preferential delivery form of iron because cells process transferrin bound iron in a physiologically appropriate way through transferrin receptors on the cell surface. Human apo-transferrin is a high affinity transferrin that can be used with a wide range of cells types. Apo-transferrin can be loaded with iron prior to use or added directly to an iron containing medium._x000D_ Packaging_x000D_ 1, 5 g in poly bottle_x000D_ 100, 5×100, 500 mg in poly bottle_x000D_ Other Notes_x000D_ Non-heme iron-transport protein.