Table 2: Nitric oxide synthase activity in different S. aureus strains.

StrainNOS activity (%)*

SH1000 SaNOS 0
Complemented strain

%Citrulline formed in relation to total L-arginine used in the assay. Citrulline conversion in the mutant strain was below the background level (control reaction with no protein extract). Values represent average of three independent experiments ± standard deviation.