Leader peptides upstream the cys operons in Mycobacterium spp. and P. acnes and cbs operon in B. longum . a) Coordinates and protein identifiers of the first genes in the operons. b) Alignment of the leader peptides. The numbers denote genome positions of the aligned fragments. c) DNA alignment of the leader peptide genes. Start, cysteine and stop codons are shown in bold; candidate Rho-binding sites are shown in capitals.