Distribution of reads to different functional categories using COG, KEGG, NOG, and Subsystems databases. Abbreviations used are, COG (A: Information Storage And Processing, B: Metabolism, C: Poorly Characterized, D: Cellular Processes And Signaling); KEGG (A: Metabolism, B: Genetic Information Processing, C: Environmental Information Processing, D: Cellular Processes, E: Human Diseases, F: Organismal Systems), NOG (A: Information Storage and Processing, B: Cellular Processes and Signaling, C: Poorly Characterized, D: Metabolism); Subsystems (A: Carbohydrates, B: Clustering-based subsystems, C: Amino Acids and Derivatives, D: Protein Metabolism, E: Miscellaneous, F: Cofactors, Vitamins, Prosthetic Groups, Pigments, G: RNA Metabolism, H: DNA Metabolism, I: Fatty Acids, Lipids, and Isoprenoids, J: Cell Wall and Capsule, K: Respiration, L: Nucleosides and Nucleotides, M: Virulence, Disease and Defense, N: Stress Response, O: Membrane Transport, P: Metabolism of Aromatic Compounds, Q: Phages, Prophages, Transposable elements, Plasmids, R: Cell Division and Cell Cycle, S: Regulation and Cell signaling, T: Phosphorus Metabolism, U: Nitrogen Metabolism, V: Sulfur Metabolism, W: Motility and Chemotaxis, X: Secondary Metabolism, Y: Iron acquisition and metabolism, Z: Potassium metabolism, AA: Dormancy and Sporulation, AB: Photosynthesis).