|Genotype||F+ Δ(argF-lac)169 φ80dlacZ58(M15) ΔphoA8 glnX44(AS) λ+ deoR481 rfbC1 gyrA96 recA1 endA1 thiE1 hsdR17|
|Phenotype||nalidixic acid resistant|
Useful strain for Lacα complementation. This strain does not contain the lacIq gene and therefore repression on the lac promoter, present on high-copy plasmids, is incomplete.
This strain contains the F factor of NK3 and therefore can be used for infection with M13 or fd phages and derivatives. In addition the strain is lysogenic for wild-type phage λ.