Fig. 4. Effect of ventilation strategies and concentrations of lipopolysaccharide (LPS) on the number of cells recovered from lung lavage. The  hatched areas indicate the proportion of dead cells, as judged by trypan blue staining. V^T7 =tidal volume 7 ml/kg and 3 cm H²O positive end-expiratory pressure (PEEP); V^T40 =tidal volume 40 ml/kg and zero PEEP. *  P < 0.05  versus V^T7 with no LPS; †  P < 0.05  versus V^T7 with 100 ng LPS; §  P < 0.05 between groups for the number of both total cells and dead cells at the identical concentration of LPS, respectively.