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— Cleavage stage embryo scoring (day 3) (from Houghton et al., 2002).
| Embryo grade | Classification |
| Grade 1 | Even blastomeres, no fragmentation |
| Grade 2 | Even blastomeres, < 10% fragmentation |
| Grade 2.5 | 10-30% fragmentation |
| Grade 3 | > 30% fragmentation |
| Grade 4 | Only one intact blastomere |
| Grade 5 | No viable blastomeres |
