TABLE 7.

Average percentage pairwise distances for sigB in three Listeria species^a

Species	% Pairwise distance for sigB in species
	L. innocua	L. seeligeri	L. welshimeri
L. innocua	1.32
L. seeligeri	5.89	1.33
L. welshimeri	3.99	0.83	0.32

^aA neighbor-joining sigB phylogram based on the unique sigB allelic types for the 120 L. monocytogenes isolates as well as the 48 L. innocua, 48 L. seeligeri, and 48 L. welshimeri isolates used to generate average percentage pairwise distances shown here is available (supplemental Fig. 2 at http://www.foodscience.cornell.edu/wiedmann/Nightingale%20Supplementary.txt).