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Fig. 7. Reversibility of IFN{gamma} induced alterations in paracellular permeability of PEG oligomers. Cells were treated with 10 ng/ml IFN{gamma} for 48 hours. After this time IFN{gamma} was removed from the medium and the cells were allowed to recover for 24 or 96 hours: {blacksquare}, no recovery; {circ}, 24 hours; {bullet}, 96 hours. A control profile (i.e. not exposed to IFN{gamma}) is also shown {square}. Data are mean±s.e.m. of four monolayers in each group.