| Glycine, serine and threonine metabolism |
| Cysteine and methionine metabolism |
| Penicillin and cephalosporin biosynthesis |
| Taurine and hypotaurine metabolism |
| Glutathione metabolism |
| Thiamine metabolism |
| Pantothenate and CoA biosynthesis |
| Sulfur metabolism |
| Aminoacyl-tRNA biosynthesis |
| Biosynthesis of plant secondary metabolites |
| Metabolic pathways |
| Microbial metabolism in diverse environments |
| Biosynthesis of amino acids |
| Sulfur relay system |
| Protein digestion and absorption |