Comparison of C-terminal decapeptides of CysE from different organisms (proteobacteria: EcCysE, Escherichia coli CysE; StCysE, Salmonella typhimurium CysE; HiCysE, Haemophilus influenzae CysE; NmCysE, Neisseria menigitidis CysE; YpCysE, Yersinia pestis CysE; BaCysE, Brucella abortus CysE. Mycobacteria: MtCysE, Mycobacterium tuberculosis CysE. Gram-positive bacteria: SaCysE, Staphylococcus aureus CysE; BsCysE, Bacillus subtilis CysE. Plants: AtCysE, Arabidopsis thaliana CysE; OsCysE, Oryza sativa CysE). Similarity scores were calculated by the ESPript program [100] using the percentage of equivalent residues coloring scheme set at global score of 0.7.