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.
where is the microtubules located in a cell
cytoplasm