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Paracellular permeability of PP (A) and VE (B) by using [3H]-D-Mannitol flux measurements. After an incubation of 8 h with TNF (5,000, 10,000 U/mL), flux measurements were carried out for 2 h, resulting in three flux periods of 40 min each. Data are presented as mean ± SEM (n = 7).
