| aa | Amino acid |
| AJ | Adherens junction |
| BBB | Blood-brain barrier |
| CTD | C-terminal domain |
| ECL | Extracellular loop |
| EMT | Epithelial-mesenchymal transition |
| NTD | N-terminal domain |
| PDB | Protein Data Bank |
| PPI | Protein–protein interaction |
| TJ | Tight junction |
| tTJ | Tricellular tight junction |
| TM | Transmembrane |
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