“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 symmetry of gamma-TuRCs creates a cap and scaffold for the assembly of these structures. (15[1])Hydrolysis of GTP (-5[1])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. (-5[1])ATP-dependent kinesin and dynein motors “walk” along these structures. (10[1])Basal bodies anchor the development of the 9+2 configurations of these structures to form cilia and flagella. For 10 points, name these cytoskeleton-forming structures (10[1])composed of tubulin. ■END■ (10[1]0[1])