Idris: When a molecule needs to be sent from one end of the cell to another, it is stamped with an address, loaded onto a truck, transported down a highway, has its address verified, and then unloaded and put to work.

When a molecule needs to be sent from one end of the cell to another, it is stamped with an address, loaded onto a truck, transported down a highway, has its address verified, and then unloaded and put to work.