Genetic organization of the recombinant plasmids that confer Ni resistance to <i>E. coli</i>.

<p>ORFs involved in Ni resistance are shown in grey. ORFs with predicted transmembrane helices are shaded with vertical bars. Asterisks indicate incomplete ORFs. Vertical arrowheads indicate transposon insertions that either abolish the resistant phenotype (filled in black) or do not affect the resistant phenotype (empty arrowheads). The map of the vector (pBluescript II SK+) is represented at the bottom.