 ##  [Microtubule](/microtubule) 

  ##  [Microtubule](https://natural.quantumdictionary.io/microtubule-0) 

  
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**Natural &amp; Formal Sciences Dictionary**

 
Definition

A hollow cylindrical polymer composed of alpha- and beta-tubulin heterodimers that is a principal component of the cytoskeleton, providing structural support, serving as tracks for motor proteins, and assembling into mitotic spindles during cell division.