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.

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Funding: Neither development nor maintenance funded by de.NBI.