| AMT | Adsorptive-Mediated Transcytosis |
| BBB | Blood–Brain Barrier |
| CNS | Central Nervous System |
| CRIM- | Cross-Reactive Immunological Material negative |
| ERT | Enzyme Replacement Therapy |
| LSD | Lysosomal Storage Disorders |
| M6PR | Mannose-6-phosphate Receptors |
| MMR | High Mannose Receptors |
| MPS | Mucopolysaccharidosis |
| RMT | Receptor-Mediated Transcytosis |
| RTB | Ricin B Domain |