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Number indicates the numbers of embryos in which a cervical extension of the wing bud, or a cervical wing bud separated from the normal wing bud could be observed.
| A6 | B6 | C6 | A7 | B7 | Total | |
|---|---|---|---|---|---|---|
| Extension | 31 | 7 | 5 | 37 | 18 | 98 |
| Separated | 45 | 10 | 10 | 51 | 12 | 128 |
| Total | 76 | 17 | 15 | 88 | 30 | 226 |
