Figure 3.

Screening for optimal MREs in vivo. (A) A schematic view of the screening (see text for details). (B) Clones with a reporter plasmid bearing Myb-binding sites were selected on galactose medium without histidine (SC –His/Gal). An example from 48 independent clones (growing on medium ± histidine) is shown. (C) The β-Gal activities for growth-selected clones were measured as described in the legend to Figure 2 and in Materials and Methods. Based on their β-Gal activity, the clones were divided into six different groups as depicted.