| Purine metabolism |
| Glycine, serine and threonine metabolism |
| Arginine and proline metabolism |
| Chlorocyclohexane and chlorobenzene degradation |
| Cyanoamino acid metabolism |
| Chloroalkane and chloroalkene degradation |
| Glyoxylate and dicarboxylate metabolism |
| Methane metabolism |
| Carbon fixation in photosynthetic organisms |
| Carbon fixation pathways in prokaryotes |
| Atrazine degradation |
| Nitrogen metabolism |
| Metabolic pathways |
| Microbial metabolism in diverse environments |
| Biosynthesis of amino acids |
| Proximal tubule bicarbonate reclamation |
| Collecting duct acid secretion |
| Salivary secretion |
| Gastric acid secretion |
| Pancreatic secretion |
| Carbohydrate digestion and absorption |
| Protein digestion and absorption |
| Bile secretion |