KATERYNA KON / SCIENCE PHOTO LIBRARY KATERYNA KON / SCIENCE PHOTO LIBRARY
Tubulin. Molecular model of a tubulin dimer. The beta-tubulin subunit (blue) is at right and the alpha-tubulin subunit (purple) is at left. Polymers of alpha- and beta-tubulin make up microtubules, part of the cell's cytoskeleton. Microtubules help to maintain cell shape, allow some cellular mobility and are involved in intracellular transport and nuclear division.
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