| AD | Alzheimer’s disease |
| BBB | blood brain barrier |
| BCSFB | blood-cerebrospinal fluid barrier |
| cLN | cervical lymph nodes |
| CSF | cerebrospinal fluid |
| DA | dopamine |
| dcLN | deep cervical lymph nodes |
| GAL | galanin |
| Hp | haptoglobin |
| IL-6 | interleukin-6 |
| LN | lymph nodes |
| LPS | lipopolysaccharide |
| NPY | neuropeptide Y |
| PD | Parkinson’s disease |
| PFC | prefrontal cortex |
| scLN | superficial cervical lymph nodes |
| SN | substantia nigra |
| SP | substance P |
| TNF-α | tumour necrosis factor α |
| VIP | vasoactive intestinal peptide |
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