TABLE 2.

Reported morphological characteristics of microbial intracellular actin tails^a

Organism	Tail length (μm)	Tail width (μm)	Length of filaments within tail (μm)
L. monocytogenes	4–12 (58)	1 (58)	0.1 (58)b
			<0.3 (179)b
S. flexneri	5–15 (58)	0.7 (58)	0.1 (58)
Vaccinia virus	6.4–9.6 (32)	NDc	0.74 (33)
Rickettsiac	4–6 (58)	1.5 (58)	0.3–3 (58)
	16.7 (59)		>1 (75)

^aReferences are given in parentheses. 

^bOther investigators have reported that filaments within the tails of L. monocytogenes are severalfold longer than 0.1 μm (Coughlin and Mitchison, unpublished). 

^cND, not determined. 

^dR. rickettsii or R. conorii.