TABLE 2.

Inhibition of D9 macrophage RNI production by catalase C-10 correlates with the production of ornithine^a

Catalase (U/ml)	% Increase in ornithine production	NO2− (nmol/106 cells)
No addition	NDb	113.7
C-10 (2,600)	111.6	5.2
C-10 (260)	78.6	31.9
C-10 (26)	6.0	77.7

^aExperiments were carried out as described in footnote a of Table 1. Ornithine contents were quantitated as described previously (6, 10). Percent increase in ornithine production = [(ornithine level in activated macrophage culture with catalase/ornithine level in activated macrophage culture without catalase) − 1] × 100. Data shown are representative of two experiments. 

^bND, not done.