Distribution of Genes with Spurious Orthology Relationship in the ThreePyrococcus Genomes
| P. abyssi | P. horikoshii | P. furiosus | |
| Isolated | 53 (23%) | 38 (19%) | 55 (19%) |
| Clustered with each other | 50 (22%) | 47 (23%) | 46 (15%) |
| Clustered with genes missing in one Pyrococcusgenome | 125 (55%) | 117 (58%) | 196 (66%) |