<P> Microtubules are tubular polymers of tubulin that form part of the cytoskeleton that provides structure and shape to the cytoplasm of eukaryotic cells and some bacteria . The tubules can grow as long as 50 micrometres and are highly dynamic . The outer diameter of a microtubule is about 24 nm while the inner diameter is about 12 nm . They are formed by the polymerization of a dimer of two globular proteins, alpha and beta tubulin . </P> <P> Microtubules are very important in a number of cellular processes . They are involved in maintaining the structure of the cell and, together with microfilaments and intermediate filaments, they form the cytoskeleton . They also make up the internal structure of cilia and flagella . They provide platforms for intracellular transport and are involved in a variety of cellular processes, including the movement of secretory vesicles, organelles, and intracellular macromolecular assemblies (see entries for dynein and kinesin). They are also involved in cell division (by mitosis and meiosis) and are the major constituents of mitotic spindles, which are used to pull eukaryotic chromosomes apart . </P>

Where is the microtubules located in a cell