Figure 2
From: Similarity-based gene detection: using COGs to find evolutionarily-conserved ORFs
Presence of annotated genes in COGs of ORFs. Open reading frames (ORFs) of at least 90 nucleotides between stop codons were used to construct COGs at varying stringencies as described in the methods. COGs were divided into one of three groups: "All members match annotated genes" – contain only ORFs which correspond to annotated genes, "No members match annotated genes" – contain no ORFs which match annotated genes, or "Mixed" – contain some ORFs that correspond to annotated genes and some that do not. The numbers of ORFs in COGs of each of these classes are plotted along the y-axis with a logarithmic scale.