When most people imagine a living cell, they picture a microscopic bag of organic materials. In fact, as described in prior posts, a cell is a vast, organized society whose members constantly communicate, cooperate, negotiate, compete, and adapt to changing conditions. At the center of this society lies a remarkable transportation system: an immense network of molecular tracks, scaffolds, motors, signaling complexes, organelles, and regulatory molecules that continuously exch

Many of the cell’s most important functions occur through the actions of a huge, dynamic, complex scaffold that extends throughout the cell. It consists of tracks along which molecular motors walk and carry necessary cargo everywhere in the cell. This scaffold is not made like rigid, passive railroad tracks, but tracks that grow, shrink, and bend—precisely organized, but dynamic and instantly responsive. The tracks stretch from the cell's center outward like spokes, providing