At the highest level, the registry views this collection of objects as a device. The device includes
DNA,
mRNA, and
proteins. The inner workings of the device consists of, among other things,
proteins ( in this case, one that binds to the small molecule) and
DNA (for example, the promoter that is regulated by the protein) and sometimes we can ignore those details when talking about devices. What is really important is what the device does, in this case the amount of a small molecule regulates the activity of a promoter. Hence, this device might be an AHL in, POPS out receiver. The
function,
inputs and
outputs (and units) are the main way we describe a device.
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