FIG. 1.

Induction of NO by commercial preparations of S. aureus, B. Subtilis, and S. sanguis LTA in RAW 264.7 macrophages. RAW 264.7 macrophages were stimulated with increasing concentrations of S. aureus, B. subtilis, and S. sanguis LTA for 20 h before supernatants were taken for nitrite assay as described in Materials and Methods. Results represent averages of triplicate determinations ± standard errors of the means from one representative experiment repeated three times under equivalent conditions.