In some cases the specific change triggers a signal - the folded or square position may activate some other enzyme, or open a channel in a cell.
在某些情况下特别的变化能触发一个信号——折叠的或方形的状态将激活一些其他的酶，或在细胞中打开一个通道。
You can also activate hourly time signal that indicates each full hour.
您还可以激活每小时时间信号，表明每个整整一个小时。
The basal state of GA signaling is likely to be repressive and the GA signal seems to activate the pathway by de_repression to allow GA_stimulated growth and development.
GA信号传导通常处于抑制状态，GA信号通过去抑制作用激活该传导途径而促进GA刺激植物生长和发育。
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