noun[mass noun] Biochemistry
A protein that is the main constituent of the microtubules of living cells.
- In addition to actin, other filamentous systems in cells include tubulin, collagen, and DNA.
- The basic structural subunit of microtubules is the protein tubulin.
- We also detected increases in fragments of intracellular structural proteins: tubulin, actin, and myosin.
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