They are unbranched hollow tubular structures, made of the
protein tubulin
( see below ).
Tubulin heterodimers
with gdp bound to the b subunit form ring shaped assemblies in vitro.
Tubulin protein families.
Tubulin subunits
are arranged in rows called protofilaments.
Tubulin concentration.
Tubulin cytoskeleton, to maintain their shape.
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