2.
SMN1基因第7和8外显子缺失类型结果
| 分型 | 例数 | SMN1基因[例(%)] | |
| 第7和8外显子均缺失 | 仅第7外显子缺失 | ||
| Ⅰ型 | 10 | 10(100) | 0 |
| Ⅱ型 | 26 | 23(88) | 3(12) |
| Ⅲ型 | 9 | 9(100) | 0 |
| 合计 | 45 | 42(93) | 3(7) |
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