Figure 7 -. Xre regulation program allows zygotic induction of transposition function promoters in a new host after conjugal transfer.

Transfer of lacZ fused to Xre transcriptional control regions results in a burst of expression in a naive recipient strain, but not recipients expressing the Xre regulator protein. Donor and recipient were plated together for mating (solid lines) or plated separately (dashed lines) as a control. Cells were harvested and controls mixed and LacZ expression monitored by Miller units as indicated. All data indicate mean +/− standard deviation (n=3).