Raghav Agrawal on Nostr: How does a doorbell on the outside reach machinery on the inside? A courier molecule: ...How does a doorbell on the outside reach machinery on the inside? A courier molecule: cAMP. The GO bell speeds up its maker; more couriers = louder "release." But insulin runs a shredder (PDE-3B) that destroys couriers. So eating doesn't just go quiet, it actively erases the signal. Two off-switches, one go-switch