Instead of looking for homozygous variants where each parent carried an allele, the researchers were looking for heterozygous variants that were also not present in the parents.
研究人员寻找不存在与父母中的杂合变异体，而不是寻找每位亲本携带一个等位基因的纯合变异体。
2
In genetics, refers to an allele that is expressed in both the heterozygous and homozygous condition.