Number of genes per cluster of likely ortholog genes (CLOGs). The majority of CLOGs consist of only one gene. CLOGs with 16 genes, indicated by the vertical line, are overrepresented. Only few clusters consist of more than 16 genes and almost no cluster consists of more than 32 genes.
Beck et al. BMC Genomics 2012 13:56 doi:10.1186/1471-2164-13-56