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Description of twin pairs.
| Pair* | Sex# | Status& | Age (yrs)∧ | Cleft type | Ethnicity@ |
| MZ1 | M | A | 8 | Left | NHW |
| M | U | 8 | – | ||
| MZ2 | M | A | 1 | Left | H |
| M | U | 1 | – | ||
| MZ3 | M | A | 10 | Left | H |
| M | U | 10 | – | ||
| MZ6 | M | A | 8 | Left | H |
| M | U | 7 | – | ||
| MZ7 | M | A | 2 | Left | NHW |
| M | U | 2 | – | ||
| MZ8 | M | A | 15 | Left | NHW |
| M | U | 15 | – |
*All samples were saliva. MZ, monozygotic; #M, male; &A, affected; U, unaffected;∧Age, Age at sampling; @NHW, Non-Hispanic White; H, Hispanic.
