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Membrane permeability effects with the major porins of E. coli. The outer membrane excludes polar nutrients and antibacterial compounds, whereas OmpC porin with limited permeability provides lower general permeability than OmpF, which is the most open porin in E. coli. The schematic is based on data discussed in Liu and Ferenci (2001); Nikaido (2003); Pages et al. (2008); Delcour (2009)).
