| Code | Name | Deposits | Targets | Ligand Type |
|---|---|---|---|---|
| MLZ | n-methyl-lysine | 1 | 1 | crystallization |
| MLT | 2 | 2 | other | |
| MLT | 3 | 3 | biological | |
| MLT | 6 | 5 | crystallization | |
| MLI | 1 | 1 | other | |
| MLI | 1 | 1 | biological | |
| MLI | 12 | 6 | crystallization | |
| MLC | 1 | 1 | crystallization | |
| MLA | 1 | 1 | other | |
| MLA | 7 | 4 | crystallization | |
| MLA | 2 | 2 | biological | |
| MGP | 7-methyl-guanosine-5'-triphosphate | 2 | 1 | biological |
| MG | magnesium | 31 | 26 | biological |
| MG | magnesium | 49 | 46 | crystallization |
| MG | magnesium | 30 | 27 | other |
| MES | MES | 6 | 6 | other |
| MES | MES | 20 | 10 | crystallization |
| MCL | nz-(1-carboxyethyl)-lysine | 1 | 1 | biological |
| MAL | maltose | 2 | 2 | biological |
| M7G | 7n-methyl-8-hydroguanosine-5'-diphosphate | 4 | 1 | biological |