Amount and functional distribution of paralogs in cyanobacterial genomes. To the left a plot of proportion of protein groups containing paralogs (x-axis) and total number of paralogous gene copies (colour of circles). Numbers in the right margin of the plot show the average number of gene copies for paralogs. Organisms are ordered according to their position in the phylogenetic tree. To the right a heat map of the functional distribution of paralogs classified according to the Cluster of orthologous groups (COG) categories. Abbreviations for functional categories are as follows: t, a subset of L containing 26 transposase categories; O, posttranslational modification, protein turnover and chaperones; S, function unknown; L, replication, recombination and repair; P, inorganic ion transport and metabolism; T, signal transduction mechanisms; M, cell wall/membrane/envelope biogenesis; R, general function prediction only; J, translation, ribosomal structure and biogenesis; V, defence mechanisms; U, intracellular trafficking, secretion and vesicular transport; G, carbohydrate transport and metabolism; K, transcription; C, energy production and conversion; Q, secondary metabolites biosynthesis, transport and catabolism; E, amino acid transport and metabolism; N, cell motility; H, coenzyme transport and metabolism; F, nucleotide transport and metabolism; D, cell cycle control, cell division and chromosome partitioning; I, lipid transport and metabolism. Categories are ordered by maximum percentage.