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| Time of cleavage after fertilization | Nature of membranes |
|---|---|
| 0-3 days | Dichorionic Diamniotic (DCDA) |
| 4-8 days | Monochorionic Diamniotic (MCDA) |
| 9-12 days | Monochorionic Monoamniotic (MCMA) |
| 13 days or more | Conjoint twins |
