| Alanine, aspartate and glutamate metabolism |
| Cysteine and methionine metabolism |
| Taurine and hypotaurine metabolism |
| Selenocompound metabolism |
| D-Alanine metabolism |
| Carbon fixation in photosynthetic organisms |
| Aminoacyl-tRNA biosynthesis |
| Biosynthesis of plant secondary metabolites |
| Metabolic pathways |
| Microbial metabolism in diverse environments |
| Biosynthesis of amino acids |
| ABC transporters |
| Sulfur relay system |
| Protein digestion and absorption |
| Mineral absorption |