Transcriptome map of the class I integron-containing region of pAR060302. Antibiotic treatment conditions are labeled along the y axis. The x axis has a scale of 0 to 2,500 reads aligned per base. Arrows indicate direction of transcription. a, antibiotics are abbreviated as follows: ampicillin, Amp; florfenicol, Ffl; and streptomycin, Str.