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| Hydrogen bond | Occurrence rate |
|---|---|
| HEM@O1-Arg441@Nη | 95% |
| HEM@O1-Arg101@Nη1 (Hη1) | 93% |
| HEM@O2-Arg101@Nη1 (Hη2) | 92% |
| HEM@O3-Arg132@Nη | 89% |
| HEM@O3-Trp128@Nε | 75% |
| HEM@O4-Ser437@Oγ | 69% |
| HEM@O2-Arg101@Nη2 | 55% |
| HEM@O4-Val374@N | 10% |
