Involvement of IL-1 in the mechanical ventilation-induced inflammatory response. KC levels in lung homogenates expressed as nanogram cytokine per microgram total protein. Data are expressed as box-and-whiskers plots, with min to max range as whiskers. Results of analysis in the non-ventilated (C) and ventilated (V) wild-type (WT) mice and IL-1αβ knockout (-/-) mice are shown. *p < 0.05.