“…The first authors studied PEI films and reported negligible cytotoxicity, using mouse 3T3 mouse fibroblasts, and neglible hemolysis (11,26). Various cell types have been studied in the meantime, such as fibroblasts, hepatocytes, endothelial cells, platelets, macrophages, and osteoblast‐like cells (8–16) so that PEI scaffolds should not only be considered for apheresis (23) but other applications such as biohybrid organs (9,12), or implants (10,27). Human hepatoblastma C3A cells were cultivated on PEI flat sheet membranes, and the cell attachment, morphology, proliferation, and function were studied and compared to less hydrophobic membranes such as a polyacrylonitrile‐N‐vinylpyrollidone copolymer membrane (9).…”