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对大多数遗传病,目前尚无有效的治疗方法。因此降低患儿出生率或给以防治是十分重要的。产前诊断、症发前诊断(presy-mptomatic diagnosis)和杂合子检出正是达到这一目的的必要手段。70年代后期迅速
There is currently no effective treatment for most genetic diseases. Therefore, it is very important to reduce the birth rate of children or give prevention and treatment. Prenatal diagnosis, presymptomatic diagnosis (presy-mptomatic diagnosis) and detection of heterozygotes is the necessary means to achieve this goal. The late 70s quickly