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Possible interactions presented in KEGG are classified into two groups, gene relationships and others relationships. First the four types of gene relationships are presented.
| KEGG relationships | Description |
|---|---|
| Gene relationships | |
| ECrel | Enzyme-enzyme relation |
| PPrel | Protein-protein interaction |
| GErel | Gene expression interaction |
| PCrel | Protein-compound interaction |
| Others | |
| compound-compound | Compound-compound interaction |
