FIG. 1.

Deletion analysis of the fruA promoter region. Developmental lacZ expression was determined for M. xanthus DK1622 bearing integrated plasmids with fruA DNA from −185 to +50 bp (•) or −100 to +50 bp (○) fused to lacZ. Also shown is the vector, no-insert negative control (▴). The average β-galactosidase specific activity of at least three independent isolates is expressed as nanomoles of o-nitrophenyl phosphate per minute per milligram of protein. Error bars show 1 standard deviation of the data.