CXCL1 and Klebsiella pneumonia: To obtain further insight in the role of MyD88 in cells targeted by LysM- and Tie2-driven Cre recombinase in lung inflammation during Klebsiella pneumonia, we measured the levels of the proinflammatory cytokines IL-1β, TNF-α, IL-6, the anti-inflammatory cytokine IL-10 and the neutrophil attracting chemokines CXCL-1 and CXCL-2 in lung homogenates (table 1).