"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.
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Please review the linked page for context.
If you can think of something better than this,
please add it to the database