Identification of the transcriptional start point of the msrAB operon. The gene organization of msrA and msrB in B. subtilis chromosome is shown. The arrowheads indicate the direction of transcription. 'P' means promoter. The transcriptional start point (+1 site) is indicated in bold case. Predicted -10 and -35 regions are shown in bold and boxed. The translational start site is in bold case and underlined.