If you look in the normal population and ask what fraction of people have [a defect in methylation in the gene encoding insulin-like growth factor 2] it's about 5 percent.
如果你观察普通人群，调查多少比例的人有[胰岛素类生长因子2基因编码甲基化的缺陷]，大概是百分之5。
2
The longevity prize is held by an animal that could not make the receptor molecule for growth hormone and was thus a fraction of the size of normal mice.
长生奖的得主则是一只无法合成生长激素受体分子的老鼠——其体型与一般老鼠并无二致。
3
Even with the growth since then, China's millionaires are still a fraction of the more than 2.5 millionaires in the U.S..