Table 1.

Strains Used in This Study

Strain	Characteristics	Reference or source
Listeria monocytogenes 10403S	Laboratory parent strain	Bishop and Hinrichs (1987)
L. monocytogenes FSL A1-254	10403S ΔsigB	Wiedmann et al. (1998)
L. monocytogenes FSL P1-002	10403S Δlmo2570	This study
L. monocytogenes FSL B2-124	10403S ΔsigL	Chaturongakul, unpublished
L. monocytogenes FSL B2-127	10403S ΔsigB/ΔsigL	Chaturongakul, unpublished
Listeria innocua FSL C2-008		Woodling and Moraru (2005)
Listeria ivanovii FSL C2-010		Wiedmann, unpublisheda
Listeria welshimeri FSL N1-064		Fish processing plant environment
Listeria seeligeri FSL N1-067		Fish processing plant environment
Bacillus subtilis PY79	Prototroph, parent strain	Youngman et al. (1984)
B. subtilis EG351	PY79 Pspac-hy-sdpABC	Butcher and Helmann (2006)

^aIsolate kindly provided (as USDA 2717) by I. Wesley, USDA-ARS.

USDA-ARS, U.S. Department of Agriculture's Agricultural Research Service.