Roman L. Tatusov, Darren A. Natale, Igor V. Garkavtsev, Tatiana A. Tatusova, Uma T. Shankavaram, Bachoti S. Rao, Boris Kiryutin, Michael Y. Galperin, Natalie D. Fedorova, Eugene V. Koonin. The COG database: new developments in phylogenetic classification of proteins from complete genomes. Nucleic Acids Research, 29(1):22-28, 2001.
Abstract is missing.