Given the task definition and input, reply with output. In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

Proteins associated with these structures include kinesins and dynein, which move along them in order to transport other molecules throughout the cell. Many of these structures in a given cell will be in a state of dynamic instability, in which the protein subunits that make them up can be either added to or removed from the plus end of the structure at any given time. The ability of the structures to shorten is useful during mitosis, when they attach to the kinetochores of chromosomes and pull them toward the spindle poles. For 10 points, name these components of the cytoskeleton, which also make up cilia and are composed of tubulin subunits.

Science