In normal circumstances, however, the SCN reacts to the lengthening nights by instructing the brain's pineal gland to secrete more of the hormone called melatonin.
然而，在正常情况下，SCN对夜晚延长的反应是，它会指示大脑的松果腺增加褪黑激素的分泌。
This mechanism is associated with melatonin, a pigment secreted by the pineal gland, though scientists are not sure exactly how it operates.
该机制与松果腺分泌的一种色素---褪黑素有关，虽然科学家还不确定其如何起作用。
Melatonin, a hormone produced by the pineal gland in response to darkness, is thought to play a primary role in controlling the body's circadian rhythm.
褪黑激素，黑暗时松果腺产生的一种激素，被认为在控制身体昼夜节律起主要作用。
Melatonin (MT) is secreted by the pineal gland and has obvious biological rhythmicity including circadian, season rhythm and life rhythm (aging clock).
褪黑素(MT)由松果腺分泌，具有明显的生物节律性，包括昼夜节律、季节节律和生命周期节律。
Melatonin is an important hormone synthesized and secreted by the pineal gland.
褪黑素是人体脑内松果腺合成与分泌的一种重要激素。
"We know that sunlight affects the pineal gland and we have indications that melatonin, through other compounds, is involved in regulating eye length," says Belkin.
“我们知道日光会影响松果腺，而且我们已经指出褪黑素通过其他物质调节眼睛的长度，”Belkin说。
"We know that sunlight affects the pineal gland and we have indications that melatonin, through other compounds, is involved in regulating eye length," says Belkin.
“我们知道日光会影响松果腺，而且我们已经指出褪黑素通过其他物质调节眼睛的长度，”Belkin说。
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