| Alanine, aspartate and glutamate metabolism |
| Arginine and proline metabolism |
| Histidine metabolism |
| Taurine and hypotaurine metabolism |
| D-Glutamine and D-glutamate metabolism |
| Glutathione metabolism |
| Butirosin and neomycin biosynthesis |
| Glyoxylate and dicarboxylate metabolism |
| Butanoate metabolism |
| C5-Branched dibasic acid metabolism |
| Porphyrin and chlorophyll metabolism |
| Nitrogen metabolism |
| Aminoacyl-tRNA biosynthesis |
| Biosynthesis of plant secondary metabolites |
| Biosynthesis of alkaloids derived from ornithine, lysine and nicotinic acid |
| Metabolic pathways |
| Biosynthesis of secondary metabolites |
| Microbial metabolism in diverse environments |
| 2-Oxocarboxylic acid metabolism |
| Biosynthesis of amino acids |
| ABC transporters |
| Neuroactive ligand-receptor interaction |
| Gap junction |
| Circadian entrainment |
| Long-term potentiation |
| Synaptic vesicle cycle |
| Retrograde endocannabinoid signaling |
| Glutamatergic synapse |
| GABAergic synapse |
| Long-term depression |
| Taste transduction |
| Proximal tubule bicarbonate reclamation |
| Protein digestion and absorption |
| Amyotrophic lateral sclerosis (ALS) |
| Huntington's disease |
| Cocaine addiction |
| Amphetamine addiction |
| Nicotine addiction |
| Alcoholism |