FIG. 6.

Hybridization intensities to the purL oligonucleotides on an Affymetrix chip of RNA isolated from bacteria subjected for 10 min to the indicated treatments. Growth and treatment of bacteria and microarray analyses are described in Materials and Methods. Hybridization intensities are in arbitrary fluorescent units. The hybridization intensities of genes not affected by treatment with translation inhibitors remained essentially constant for the different strains and treatments (data not shown). purR refers to the ΔpurR mutant and R6 refers to its isogenic purR⁺ parent (see Materials and Methods). Additions: no indication, nothing added; +DMSO, DMSO added lacking drug; +Erm30 and +Erm120, addition of 30 or 120 ng of erythromycin per ml.