The EB1 (“E-B-1”) protein is named for its ability to localize to one part of these structures. After getting translated, proteins making up these structures often have their C-terminal tyrosine residues removed and replaced with glutamic acid and glycine chains. These structures contain binding sites for which CLASP (“clasp”) proteins and katanin (“KAH-tan-in”) compete. In 1986, Marc Kirschner and Tim Mitchison proposed that these structures coordinate their synthesis using a (*) “search-and-capture” mechanism. (10[1])These structures nucleate from gamma-TuRC-containing (10[2])(“gamma-TURK”) organizing centers known as MTOCs (“M-tocks”). These hollow structures, which are composed of protofilament arrays, make up the internal structure of basal bodies and flagella (“flah-jel-luh”). Mitotic spindles are constructed from, for 10 points, what cytoskeletal (10[1])polymers made up of tubulin subunits? ■END■