Figure 2. Differentially expressed genes grouped by COG functional classification.

Columns: O: posttranslational modification, protein turnover, chaperones; M: cell envelope biogenesis, outer membrane; L: DNA replication, recombination and repair; K: transcription; J: translation, ribosomal structure and biogenesis; G: carbohydrate transport and metabolism; F: nucleotide transport and metabolism; H: coenzyme metabolism; E: amino acid transport and metabolism; T: signal transduction mechanisms; S: function unknown; R: general function prediction only; P: inorganic ion transport and metabolism; D: cell division and chromosome partitioning; C: energy production and conversion and Hy: hypothetical protein.