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Microtubule structure and dynamics. Schematics of an assembling and a disassembling microtubule. GTP-tubulins are shown in red; GDP-tubulins are shown in green. One of the 13 protofilaments is highlighted in bold to illustrate how tubulin dimers are stacked longitudinally into linear strands. The GTP cap with a fuzzy lower boundary is indicated by the scale bar at the left
