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在２ ７０３ 例遗传咨询门诊病例中检出９ 号染色体臂间倒位２１ 例，将本组ｉｎｖ（９）的频率与普通群体ｉｎｖ（９）的频率作比较，并通过对伴有其它性状的ｉｎｖ（９）家系的分析，讨论了ｉｎｖ（９）的遗传效应问题。
The frequency of inv (9) in this group was compared with the frequency of inv (9) in the general population in 21 out of 2 703 cases of genetic counseling outpatients. The inv (9) pedigree analysis discussed the genetic effect of inv (9).