Photoreceptors are cells that respond to light by sending out a chemical signal.

光感受器是通过发出化学信号来对光作出反应的细胞。

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Garter snakes detect a chemical signal from earthworms—one of their favorite foods—via the VNO, and they use this signal to track their prey.

束带蛇通过 VNO 探测到来自蚯蚓（它们最喜欢的食物之一）的化学信号，然后它们利用这个信号来追踪它们的猎物。

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The mechanism that triggers the final form could be a chemical signal, for instance.

例如，触发了最终形状的机制可能是一个化学信号。

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In the case of a ligand-receptor, a chemical signal in the form of a concentration of ligand gets converted into a biochemical signal.

在配体-受体系统中,配体浓度这种化学信号,转化为生化信号

耶鲁公开课 - 生物医学工程探索课程节选

This is a mechanism by which an electrical signal comes here, it gets translated into a chemical signal, the chemical diffuses across the gap and reinitiates a - an electrical signal in the next cell and that's one way that it happens.

这就是电信号产生的机理,电信号翻译成化学信号,化学物质扩散过突触间隙,重新激起下个细胞中的电信号,这是一种方式

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These switches are set off by a chemical signal sprayed on genetically tinkered seed.

ECONOMIST: Terminator genes

In addition, he said, bees had at their disposal a much more powerful chemical alarm signal.

BBC: Honey-bees found to have bite that stuns

Ahead of this year's conclave, spokesman Father Federico Lombardi said the chemical technique had been improved to ensure a clear color signal.

CNN: March 13, 2013 -- Updated 0018 GMT (0818 HKT)