Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A globular protein that is the basic structural constituent of microtubules.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun biochemistry Any of a group of proteins used as the material for microtubules
  • noun biochemistry Specifically, the dimer of α-tubulin and β-tubulin

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

tubule +‎ -in

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