| Score | Criteria |
| 1 | Non-fusion with no adhesion. |
| 2 | Non-fusion with some apparent adhesion. |
| 3 | Adhesion with some disintegration of MEE layers and clear partial mesenchymal confluence. |
| 4 | Complete fusion with some traces of MEE cells or seam remaining. |
| 5 | Complete fusion with no evidence of MEE cells or seam visible. |
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