“Tentacles” of these structures are being studied for insight into breast cancer cell metastasis. AAA proteins like spastin and katanin (15[1])regulate the size and number of these (15[1])structures. (15[1])The 13-fold (-5[1])symmetry of gamma-TuRCs (15[5]-5[1])creates a cap (15[1])and scaffold (15[1])for the assembly of these (15[1])structures. (15[2]-5[1])Hydrolysis of GTP (-5[2])to GDP (15[2])at the ends of these structures leads to (15[1])the “catastrophe” (15[1])phase of their characteristic (*) “dynamic (10[1])instability.” (10[1])These structures (-5[1])are nucleated (10[1])at namesake “organizing centers” composed (10[1])of (-5[1])a centrosome (10[1])surrounded (10[1])by (10[1]-5[1])pericentriolar (10[1]-5[1])material. (-5[2])ATP-dependent kinesin and dynein motors (10[1]-5[1])“walk” (10[1])along these structures. (10[3]-5[1])Basal bodies anchor the development (10[3])of the 9+2 configurations of these structures (10[1]-5[1])to form cilia and flagella. (-5[1])For 10 points, (10[1])name these cytoskeleton-forming structures (10[1]-5[1])composed of tubulin. (10[3])■END■ (10[7]0[11])