While it's not a single protein, the cytoskeleton is a network of protein filaments that provide structural support and help cells maintain their shape. It's like a scaffolding system within the cell.

Here's a breakdown of the main components of the cytoskeleton:

* Microtubules: These are long, hollow tubes made of the protein tubulin. They help with cell division, organelle movement, and providing structural support.

* Microfilaments: These are thin, solid rods made of the protein actin. They are involved in cell movement, muscle contraction, and maintaining cell shape.

* Intermediate filaments: These are tough, rope-like structures made from various proteins depending on the cell type. They provide strength and stability to the cell.

The cytoskeleton is dynamic and constantly changing, allowing cells to adapt to their environment and perform their specific functions.