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Expression of MIP-2 (A) and TNFα (B) mRNA in the lungs of mice that were ventilated with different tidal volumes without and with application of PEEP. Columns represent mean+SEM of spontaneous breathing (spon breath) mice and ventilation groups. *: P < 0.05 vs spontaneous breathing animals. § P < 0.05 vs + PEEP. +: P < 0.05 vs ventilation with a Vt of 5 ml/kg or 7 ml/kg without PEEP.
