老鼠的胎儿在实验盘里渡过了它们正常妊娠期的一半以上日子。发育中的胎儿显示出,有三种物质对于它的正常生长至关重要。这个已经探索了许多年的发现,也许会有助于科学家更好地了解人类胎儿先天缺陷的基本原因。胎儿先天缺陷的原因,大部分至今仍未弄清楚。但是 Mouse fetuses spent more than half of their normal gestation days on the experimental plate. The developing fetus shows that there are three substances that are crucial to its normal growth. This discovery, which has been explored for many years, may help scientists to better understand the underlying causes of human birth defects. Most of the causes of birth defects are still unknown. but