To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 3 Microtubule in vitro growth with purified tubulin dimers. Adding chimeric Klp61F protein promoted persistent microtubule polymerization. Trim9 and Klp61F promote polymerization of new dendritic microtubules along parallel microtubules Chengye Feng, Joseph M. Cleary, Gregory O. Kothe, Michelle C. Stone, Alexis T. Weiner, James I. Hertzler, William O. Hancock, and Melissa M. Rolls J Cell Sci 2021. 134:None-None; doi: 10.1242/jcs.258437 Download Original Video