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. 2008 May 30;95(5):2487–2499. doi: 10.1529/biophysj.108.129072

FIGURE 4.

FIGURE 4

(a) Straight (crystal) structure of the GDP-tubulin dimer, together with center-of-mass positions of the 12 major helices and 10 β-sheets, as defined by Nogales et al. (4). Positions of the center of mass in each monomer are shown by CG spheres. The bigger spheres represent the center-of-mass positions of the β-sheets, whereas smaller spheres represent those of helices. (b) Straight and curved conformations of the GDP-tubulin dimer with a pair of vectors demonstrate the angle traced by a particular secondary structure as an example.