本品是叶酸还原型的甲酰化衍生物，系叶酸在体内的活化形式（参见“叶酸”）。甲氨蝶呤等叶酸拮抗剂的作用是与二氢叶酸还原酶结合而阻断叶酸向四氢叶酸盐转化。
对此，斯坦福表示：“今天，我们被脂肪和胆固醇困扰是因为我们能随时去超市用这些食品将自己填饱。”
"We have an obsession today with fat and cholesterol because we can go to the market and stuff ourselves with it," Stanford said.
当在福岛县的反应器关闭的时候，本应该能被从核心汲取的水冷却。
When the reactor at Fukushima shut down, it should have been kept cool by water pumped through the core.
为了能更好的观察它们，斯坦福的分子和细胞生理学教授斯蒂芬·史密斯以及他的团队研发了一种称作层面摄影法的方法。
To get a better look at them, Stephen Smith, a professor of molecular and cellular physiology at Stanford, and his team developed a process called array tomography.
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