title: Orthology, paralogy and proposed classification for paralog subtypes.
authors.forename: Erik L L
authors.initials: EL
authors.lastname: Sonnhammer
authors.forename: Eugene V
authors.initials: EV
authors.lastname: Koonin
mesh_terms: D019143:Evolution, Molecular; D020440:Gene Duplication; D020131:Genes, Duplicate; D010802:Phylogeny