Effects of deletions within the trp leader region on TRAP-mediated transcription termination in vivo.

a − cells grown in the absence of exogenous L-tryptophan; +, cells grown in the presence of 50 µg/ml of L-tryptophan.b Values are the average of two or three independent experiments, each performed in triplicate, ± the standard deviation.c To determine fold regulation by TRAP, the ratio of BG4233 Trp- to BG2087 Trp+ was determined for each experiment, and the value shown is the average +/− the standard deviation.d Fold tryptophan regulation was determined by taking the ratio of BG2087 Trp- to BG2087 Trp+ for each experiment, and the value shown is the average +/− the standard deviation.