Table 4. Characteristics of Test Ontologies/Schemas.
| Features | SBO | GRO | TarBase |
| Number of Instances | 0 | 4 | 0 |
| Number of Concepts | 604 | 507 | 76 |
| Number of Properties | 0 | 9 | 19 |
| Number of Relationships | 1 | 24 | 23 |
| (excluding is_a) |
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