Nitrate/nitrite (NOx) content of lung lavage supernatant from mice exposed to ovalbumin with or without treatment with the arginase inhibitor, nor-NOHA (100 ug/mouse, about 5 mg/Kg, administered ip in a total volume of 100 uL 30 minutes before each ovalbumin aerosol challenge commenced, a total of 6 injections over 2 weeks). *, significantly greater than OVA alone, P=0.0128. Values shown on the graph are group mean concentrations (uM) ± SE, with experimental group size, N, represented as a bracketed number above the bar.