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FIG. 2.

FIG. 2.

Uptake of tritium-labeled steroid molecules by HNCE4 cells complemented with pSportI plasmid-encoded RND pumps from the E. coli genome. Of the six RND-type pumps encoded within the E. coli genome, AcrD and YhiV were previously shown to function heterologously with AcrA to produce a drug resistance phenotype (5, 6).