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Confidential of ancestral sequence based on different datasets.
| Subset | No. of seq | Ancestor | Length (aa) | Possibility (95% CI) |
| T74 | 74 | T74N1 | 938 | 0.968 (0.964–0.973) |
| S7 | 23 | S7N1 | 940 | 0.990 (0.985–0.994) |
| DB90 | 13 | DB90N1 | 938 | 0.973 (0.969–0.978) |
| DB95 | 47 | DB95N1 | 939 | 0.994 (0.989–0.999) |
F = 27.115 and P < 0.001.
