"Picture a switchboard operator of old. There she sits, in front of a dizzying array of toggles and lights, ready to push buttons and stretch cords to connect incoming calls to just the right recipient. She might even listen in on the conversations from time to time. The protein Ras is like that operator."
See the link for a good picture and longer discussion.
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.