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TABLE 4.

Effect of deleting the noncanonical 21-bp sequence from the pWR100parS site

Plasmid par operon carried Test plasmid parSa site % Retentionb (25 generations)
pGB2 None pWR100parSΔ21 <2
pALA2620 pWR100parA-parB pWR100parS 72
pALA1413 P1parA-parB pWR100parS 96
pGB2 None pWR100parSΔ21 <2
pALA2620 pWR100parA-parB pWR100parSΔ21 28
pALA1413 P1parA-parB pWR100parSΔ21 78
a

The test plasmids were λ-P1::5RΔ1005::pALA2602 (pWR100parS) or λ-P1::5RΔ1005::pALA2621 (pWR100parSΔ21).

b

All values were obtained from a single experiment. Duplicate experiments gave similar results. The controls using the wild-type pWR100parS are duplications of tests reported in Table 1, where similar but not identical values were obtained.