The IL-12 p40 subunit was investigated in lung, and significantly higher levels were found in WT mice than in ChemR23−/− mice at days 8 and 10 post-infection, both for the protein (2.50±0.16 versus 1.40±0.30 ng/ml respectively at day 8, 1.30±0.20 and 0.50±0.03 ng/ml at day 10; p<0.05) (Figure 4B), and the transcript (∼3-fold difference; p<0.05) (Figure S2). Here, CMKLR1 is linked to infection.