“Tentacles” of these structures are being studied for insight into breast cancer cell metastasis. AAA proteins like spastin and katanin regulate the size and number of these structures. The 13-fold (-5[1])symmetry of gamma-TuRCs (-5[1])creates a cap and scaffold for the assembly of these structures. Hydrolysis of GTP to GDP at the ends of these structures leads to the “catastrophe” phase of their characteristic (*) “dynamic instability.” These structures are nucleated at namesake “organizing centers” composed of a centrosome surrounded by pericentriolar material. ATP-dependent kinesin and dynein motors (10[1])“walk” along these structures. Basal bodies anchor the development of the 9+2 configurations of these structures (-5[1])to form cilia and flagella. (-5[1])For 10 points, name these cytoskeleton-forming structures composed of tubulin. (10[2])■END■ (0[7])