PCR analysis of the deletion in soxF of
GBsoxFΔ. Genomic DNA was used as a template for PCR
with primers 5 and 6 binding within soxF. Purified PCR
assay mixtures (4 μl) were applied to each well. Lanes: 1,
HindIII-digested λ DNA; 2, plasmid control pRD123.2;
3, mutant GBsoxFΔ; 4, cointegrate
GB17::pRD123.2; 5, GB17.