We investigate the mechanical origin of polymorphic structures in two-dimensional tubulin assemblies. of which microtubules are the best known example. These structures feature twisted ribbons. flat tubulin sheets. https://www.bekindtopets.com/mega-pick-Silbrade-Braid-Reinforced-Silicone-Tubing-1-4-ID-x-520-OD-x-1-hot-grab/