Fig. 4. Sequence alignment of the bacterial SelB sequences present in the Swissprot, Trembl and GenBank databases. White, light grey and dark grey boxes indicate increasing degrees of conservation. The positions of compensatory mutations in response to loop mutations are shown by filled arrows (Kromayer et al., 1999). The positions of compensatory mutatons in response to bulge mutations are shown by open arrows (Li et al., 2000). Abbreviations of species names (accession Nos): MOOTH, Moorella thermoacetica (Swissprot Q46455); ECOLI, Escherichia coli (Swissprot P14081); SALEN, Salmonella enterica serovar typhi (GenBank NP_458244); YERPE: Yersina pestis (GenBank 16120353); HAEIN, Haemophilus influenza (Swissprot P43927); PASMU, Pasteurella multocida (Trembl Q9CK68); PSEAE, Pseudomonas aeruginosa (Trembl Q9HV02); RHIME, Rhizobium meliloti (Trembl Q931D5); DESBA, Desulfomicrobium baculatum (Swissprot Q46497); EUBAC, Eubacterium acidaminophilum (Trembl Q9S3K2); AQUAE, Aquifex aeolicus (Trembl O67141); CAMJE, Campylobacter jejuni (Trembl Q9PMS1).