While each part of the cytoskeleton is composed of different types of proteins, they are all essentially long protein polymers. Here's a breakdown:
* Microtubules: Made of the protein tubulin.
* Microfilaments: Made of the protein actin.
* Intermediate filaments: Made of a variety of proteins, depending on the cell type, such as keratin, vimentin, and lamin.
Therefore, the protein is the fundamental building block that unites all three components of the cytoskeleton.
