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Cell culture inserts for 24-well plates. 0.4 micrometer pores, Translucent, High Density PET Membrane. Track-etched polyethylene terephthalate (PET) membranes have a smooth surface and defined cylindrical pores that traverse the membrane. Low-protein binding. Sterilized by gamma irradiation. Packed in individual blister packs. Innovative hanging design facilitates pipetting and allows for co-culture. Membranes are easily removed, easy to handle, and remain flat. Applications include transport, diffusion, and secretion of small molecules into, out of, or through a cell monolayer; barrier function (TEER measurements). DNR (Latex) free. 0.3 sq. cm growth area. Uncoated membranes growth surface. 0.2-0.35mL typical working volume. This pore size offers maximum diffusion of large molecules or viruses.