Proteins known as CLK, or clock, accumulate in the SCN throughout the day.

称为 CLK 或时钟的蛋白质全天都在 SCN 中积累。

Traveling through the optic nerve to the SCN, it communicates what's happening in the outside world.

通过视神经到达视交叉上核，它传达外界正在发生的事情。

Siffre, stuck in his dark cave, relied on the most primitive clock in the suprachiasmatic nucleus, or SCN of the hypothalamus.

Siffre 困在他的黑暗洞穴中，依靠视交叉上核或下丘脑 SCN 中最原始的时钟。