TABLE 3.

Phenotypic properties of S. aureus RN6390 and isogenic derivatives^a

Strain	Protease activity (n = 4) at 18 h	Coagulase titer (n = 3) at:		% Fn binding (n = 2) at:
		2 h	7 h	2 h	6 h
RN6390	0.830 ± 0.04	4.3 ± 0.7	1.0 ± 1.0	6.4 ± 0.4	0.8 ± 0.1
RN6911	0.004 ± 0.002*	4.7 ± 0.3	4.7 ± 0.3*	17.1 ± 0.1*	5.3 ± 0.3*
SP6391	0.310 ± 0.06*	3.7 ± 1.2	0.7 ± 0.7	4.1 ± 1.6	1.2 ± 0.3
SP6912	0.039 ± 0.002*	NDb	ND	ND	ND

^aProtease activity (A₅₇₄), coagulase titer (log₂), and percent binding of ¹²⁵I-Fn were determined for cultures harvested in exponential growth phase (2 h) or stationary phase (6, 7, or 18 h.). Values are reported as the mean of n independent assays ± standard error of the mean. Values that are significantly different from S. aureus RN6390, as established by the Bonferroni t test (P < 0.05) are indicated by asterisks. 

^bND, not determined.