- Tubulin is a protein that is a basic building block that is encoded to form microtubules. - Also to note are the [[microtubule-associated proteins]] (also used for microtubule formation) ## kinds of tubulin There are several kinds of tubulin employed in microtubule formation: - Alpha Tubulin - Beta Tubulin - Gamma Tubulin However, *alpha*- and *beta-tubulin* are used for building the filament, whilst *gamma-tubulin* is used for microtubule filament creation. Gamma-tubulin is not a part of the filament, as it is the starting point for the other two types of tubulin dimers to assemble onto.