| Purine metabolism |
| Caffeine metabolism |
| Glycine, serine and threonine metabolism |
| Arginine and proline metabolism |
| Chloroalkane and chloroalkene degradation |
| Glyoxylate and dicarboxylate metabolism |
| C5-Branched dibasic acid metabolism |
| Methane metabolism |
| Carbon fixation pathways in prokaryotes |
| Metabolic pathways |
| Biosynthesis of secondary metabolites |
| Microbial metabolism in diverse environments |