Tryptophan has to fight with other amino acids to cross the blood-brain barrier and get into the brain.

色氨酸必须打败其他的氨基酸，才能通过血管-大脑的障碍物，到达大脑。

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In the second stage the parasites cross the blood-brain barrier to infect the central nervous system.

在第二阶段，寄生虫穿过血脑屏障感染中枢神经系统。

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We’ve shown that a natural system could be exploited to deliver drugs across the blood-brain barrier.

我们用自然分类系统可发出了跨过血脑屏障的药物技术。

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Substances that cannot cross this barrier are unlikely to make effective treatments for a brain disease.

ECONOMIST: Creutzfeldt-Jakob disease