| Purine metabolism |
| Alanine, aspartate and glutamate metabolism |
| Glycine, serine and threonine metabolism |
| Arginine and proline metabolism |
| Cyanoamino acid metabolism |
| Glyoxylate and dicarboxylate metabolism |
| Nitrogen metabolism |
| Metabolic pathways |
| Biosynthesis of secondary metabolites |
| Microbial metabolism in diverse environments |
| Biosynthesis of amino acids |
| Proximal tubule bicarbonate reclamation |
| Collecting duct acid secretion |
| Protein digestion and absorption |
| Vibrio cholerae infection |
| Epithelial cell signaling in Helicobacter pylori infection |