Table 2.
Main Characterized Operons Involved in Differential Losses or Gains within Pyrococcus Lineage
| Common toP. abyssi | Amino acid biosynthesis (Val-Leu-Ile) |
| and P. furiosus | Aromatic amino acids biosynthesis (aro) |
| Aromatic amino acids biosynthesis (trp) | |
| Maltose transport (mal) | |
| Phosphate uptake | |
| Common to P. abyssi and P. horikoshii | Chemotaxis-related genes (che) |
| Unique to P. abyssi | Restriction/modification enzymes |
| Unique to P. furiosus | Histidine biosynthesis (his) |
| Riboflavin biosynthesis (rib) | |
| Trehalose transport | |
| Citrate cycle | |
| Cobalt transport |
