Evolutionary genealogy of genes: Non-supervised Orthologous Groups (eggNOG)

eggNOG is a database of nested orthologous gene groups (NOGs) infered using unsupervised clustering applied to >2,000 complete genomes followed by comprehensive characterization and analysis of the resulting gene families. eggNOG provides orthologous group assignments at >100 different taxonomic levels as well as multiple sequence alignments, maximum-likelihood trees and broad functional annotations for each group accessible via a web interface or through bulk download. Part of the Microbiome Analysis Toolbox.