TABLE 2.

SQR activities of wild-type and mutant C. tepidum strains

Strain	Sp act (μmol of dUQ reduced [mg of protein]−1 min−1) with:
	1.0 mM Na2S	0.5 mM Na2S
Wild type	87.0 ± 6.9	63.0 ± 4.5
CT0117::TnOGm	31.5 ± 4.5a	7.5 ± 2.6a
CT0876::TnOGm	82.5 ± 2.6	60.0 ± 6.9
CT1087::TnOGm	52.5 ± 5.2a	45.0 ± 9.0a
CT0117::TnOGm, CT1087::TnEm	NDb	ND

^aP < 0.05 (n ≥ 3) by the t test for comparison to the wild-type strain assayed under the same conditions.

^bND, not detected.