Figure 4

Relative proportion of leaderless genes in COG function categories. The function categories are: A, RNA processing and modification (information storage and processing); B, chromatin structure and dynamics(information storage and processing); K, transcription (information storage and processing); H, coenzyme transport and metabolism (metabolism); R, general function prediction only (poorly characterized); F, nucleotide transport and metabolism (metabolism); S, function unknown (poorly characterized); L, replication, recombination, and repair (information storage and processing); E, amino acid transport and metabolism (metabolism); O, posttranslational modification, protein turnover, and chaperones (cellular processes and signaling); I, lipid transport and metabolism (metabolism); D, cell cycle control, cell division, and chromosome partitioning (cellular processes and signaling); J, translation, ribosomal structure, and biogenesis (information storage and processing); M, cell wall/membrane/envelope biogenesis (cellular processes and signaling); Q, secondary metabolite biosynthesis, transport, and catabolism (metabolism); T, signal transduction mechanisms (cellular processes and signaling); C, energy production and conversion (metabolism); V, defense mechanisms (cellular processes and signaling); G, carbohydrate transport and metabolism (metabolism); P, inorganic ion transport and metabolism (metabolism); Z, cytoskeleton (cellular processes and signaling); U, intracellular trafficking, secretion, and vesicular transport (cellular processes and signaling); N, cell motility (cellular processes and signaling).