Figure 4. Fiber bundle formation.
Lysozyme fibers aggregate by lateral association to form bundles. Left, center: Arrows identify points at which two fibers join to form a bundle. Appearance of the bundle suggests the fibers wrap around each other in a spiral fashion, a process described by Terech [8] as helix formation. This requires the fibers be free to rotate. Right: Lysozyme fibers in a bundle may remain separated over a short distance and then rejoin, suggesting fiber helices must be aligned for bundling to occur.