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Bundle geometry, and its cross section, employed in this work. The picture depicts the hexagonal configuration and interconnections of the bundle mediated by MAP tau proteins (shown in red). A center-to-center distance of 45 nm between MT beads is enforced to correspond to 20 nm edge-to-edge spacing. The bundle consists of 19 rows of 8 μm MTs with one discontinuity in each filament. To see this figure in color, go online.
