TABLE 2.

Replication origins and their positioning

Organism	Replicon	Origin type	Polar localizationa	Position(s)
A. tumefaciens	Circular chromosome	Cori	+++	Polar
	Linear chromosome	repABC	+++	Polar
	pAtC58	repABC	++	Polar
	pTiC58	repABC	+	Polar
S. meliloti	Circular chromosome	Cori	+++	Polar
	pSymA	repABC	++	Polar
	pSymB	repABC	++	Polar
C. crescentus	Circular chromosome	Cori	+++	Polar
A. tumefaciens	pMR10	RK2	−	1/4 and 3/4
S. meliloti	pMR10	RK2	−	1/4 and 3/4
C. crescentus	pMR10	RK2	−	1/4 and 3/4

^a+++, <10% nonpolar; ++, 10 to 25% nonpolar; +, 35% nonpolar; −, never polar.