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. Author manuscript; available in PMC: 2011 Aug 11.
Published in final edited form as: Structure. 2010 Aug 11;18(8):1022–1031. doi: 10.1016/j.str.2010.05.010

Figure 2.

Figure 2

Density maps for different structural types of MTs: (a) MT 11-3 (b) MT 12-3 (c) MT 13-3 (d) MT 14-3 (e) MT 15-4 (f) MT 16-4. The secondary structural features are clearly resolved in the density maps. MT 13-3 has perfectly straight PFs (Fig 2c). In contrast, super-twists exist for other types of MTs. For MT 11-3, 12-3, 15-4, and 16-4, the density maps display a minor right-handed supertwist (Fig 2a - 2c, and 2e - 2f). For MT 14-3, the density map shows a slight left-handed supertwist (Fig 2d).