这些细胞是在那里看到启动，因为它们转换成光信号给大脑。
These cells are where seeing starts, as they convert light into signals to the brain.
当缓激肽作用于目标，这些蛋白质则导致神经细胞发出电子'痛苦'的信号给大脑。
When targeted by the bradykinin, these proteins then cause the nerve cells to send electrical 'pain' signals to the brain.
研究者很快发现，除了瘦素之外，还有一整套的化学物质给大脑发送信号，引发饥饿和饱腹的感觉。
Researchers soon found that in addition to leptin, a whole host of chemicals signal the brain to trigger hunger or fullness.
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