确认了正确的组合之后，研究人员设计了一种合成基因。它对一种能够促成细胞凋亡(一种受控的细胞死亡)的蛋白质进行编码。
Once they had the right combination, the researchers designed a synthetic gene which codes for a protein that promotes apoptosis, or programmed cell death.
对双胞胎进行设计实验可以查明智力和死亡率之间的关联程度，因为双胞胎接受着同样的环境和遗传因素的影响。
There are experimental designs, using twins, that can find out the extent to which intelligence and mortality are linked because they share environmental and genetic influences.
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