A valve in a water pipe can be closed or opened and regulates the amount of water moving through a pipe. The activity of a regulatory enzyme can affect the production of a particular metabolic intermediate that will influence a whole series of other enzymes and products.
METAMIA is a free database of analogy and metaphor. Anyone can contribute or search. The subject matter can be anything. Science is popular, but poetry is encouraged. The goal is to integrate our fluid muses with the stark literalism of a relational database. Metamia is like a girdle for your muses, a cognitive girdle.