Title: The COG database: new developments in phylogenetic classification of proteins from complete genomes.
Authors: Tatusov RL, Natale DA, Garkavtsev IV, Tatusova TA, Shankavaram UT, Rao BS, Kiryutin B, Galperin MY, Fedorova ND, Koonin EV
Journal: Nucleic Acids Res
Published: 2001-01-01
Volume: 29
Pages: 22-8