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| Rank | Keyword | Centrality |
|---|---|---|
| 1 | Transplantation | 0.20 |
| 2 | Heart transplantation | 0.16 |
| 3 | Cardiac transplantation | 0.16 |
| 4 | Tolerance | 0.12 |
| 5 | Induction | 0.12 |
| 6 | Heart | 0.11 |
| 7 | T cell | 0.11 |
| 8 | Rejection | 0.09 |
| 9 | Immune response | 0.09 |
| 10 | Expression | 0.07 |
