1. 
   microtubules
   Type of filament in eukaryotic cells composed of units of the protein tubulin. Among other functions, it is the primary structural component of the eukaryotic flagellum.
   Found op http://www.ucmp.berkeley.edu/glossary/glossary_4.html
   
   
2. 
   Microtubules
   are the largest filament in the cytoskeleton. They are the hollow tubes along which cell products are conducted long distances. The system is not unlike a railway network around the cell, sometimes involving long distances. For example, neurones transport out neurotransmitter substances along the ax...
   Found op http://www.eclipse.co.uk/moordent/page5.html
   
   
3. 
   microtubules
   <cell biology> Thin tubes made up of protein that are used to make structures involved in cellular movement such as flagella. ... (09 Oct 1997) ...
   Found op http://www.mondofacto.com/facts/dictionary?microtubules
   
   
4. 
   microtubules
   Tiny tubes found in almost all cells with a nucleus. They help to define the shape of a cell by forming scaffolding for cilia and they also form the fibres of mitotic spindle (see mitosis)
   Found op http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0025992.html
   
   

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