Figure 4. COG function classification.

Total 14,987 unigenes were assigned to 25 COG classifications. The largest cluster was for general function prediction only (4,564, 15.99%), followed by transcription (2,455, 8.60%), replication, recombination and repair (2,335, 8.18%), translation, ribosomal structure and biogenesis (2,243, 7.86%), posttranslational modification, protein turnover, and chaperones (2,157, 7.56%), carbohydrate transport and metabolism (1,795, 6.29%) and signal transduction mechanisms (1,788, 6.27%).