	Control	Air	NO2	Air-CNP	NO2-CNP
n	32	6	6	6	6
Age (days)	49	77	77	77	77
Wt (g)	158.7±12.4	239.7±13.9*	226.3±21.8*	237.3±8.5*	229.1±14.3*
TGV (ml)	2.6±0.4	4.9±0.6*	4.1±0.8*^#	3.6±0.5*^#	3.8±0.7*^#
ΔTGV (%)	0	94.5±26.3*	56.8±31.5*^#	41.2±21.8*^#	50.5±29.4*^#
TGV/Wt (ml/kg)	16.2±2.8	20.7±3.4*	18.1±3.5	15.2±2.2^#	16.8±3.1
TNF-α in serum(pg/ml)	NA	74.6±88.1	525±374.4^#	27.1±13.9^§	157.1±207.1^§
IFN-γ in serum(pg/ml)	NA	17,3±10,1	20,5±14,9	21,1±12.0	125,6±145,9^#^§

Data are mean±SD; *p<0.05 vs. control; ^#p<0.05 vs. Air; ^§p<0.05 vs. NO2, by one-way ANOVA. NA: not available.