The Identification and Classification of Bacteria (ICB) database (http:/www
.mbio.co.jp/icb) contains currently available information about the DNA gyr
ase subunit B (gyrB) gene in bacteria. The database is designed to provide
the scientific community with a reference point for using gyrB as an evolut
ionary and taxonomic marker. Nucleic and amino acid sequence data are curre
ntly available for over 850 strains, along with alignments at several diffe
rent taxonomic levels and an exhaustive review of; primer selection and bac
kground information.