Tubulin

"Tubulin functions a bit like Tinkertoys, the building toy with modular parts.

"In eukaryotes, two versions of the protein, alpha and beta tubulin, snap together. 

"Then they stack on top of each other to make long rods, which then assemble into tubes —usually 13 rods make a tube, although the number can vary depending on the specific type of cell. 

"These microtubules exist in a delicate equilibrium, stacking on new tubulin units for a while, then reaching a crisis and falling apart. 

"They grow and shrink as needed, forming an ever-changing skeleton."

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