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Locations of VirB components of the T-DNA transfer system. The VirB and VirD4 proteins are grouped according to probable functions: exocellular proteins mediating attachment (VirB1*, VirB2 pilin and VirB5), channel proteins (VirB3, VirB6, VirB7, VirB8, VirB9 and VirB10), and ATPases (VirB4, VirB11 and VirD4).
