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The thickness of the blood-brain barrier (BBB) basement membrane (BM) in vivo is in the range of 20 - 200 nm. Most widely used commercially available microporous polycarbonate (PC), polyethylene terephthalate (PET) or polytetrafluoroethylene (PTFE) membranes are 10 to 50 ?m thick. This is a substantial obstacle for communication of cells growing on both sides of membrane, like astrocytes, pericytes and endothelial cells within in vitro BBB model. For the last several years the active development of ultrathin micro...