FIG. 1.

Tel^r resistance cassettes in recombinant plasmids and transposon vectors. The organization of the kilA locus of the RK2Tel^r plasmid, spanning the kilA telAB cistrons (29) (alternatively designated klaABC [8]), is shown at the top lined up with the neighboring regions of the plasmid. The location and orientation of each gene are indicated. The three genes appear to be transcribed from a single promoter upstream of kilA. telA and telB may be translationally coupled. The 3.0-kb RK2Tel^r HincII segments used to construct the tellurite resistance cassettes shown at the bottom are labeled with the designations of the plasmids.