Different morphologies created using the “sticky ended” self-assembling fiber (SAF) system of Woolfson. a) TEM images of (left to right) straight, kinked, branched, and segmented coiled coil fibers. b) Schematic representations of the different assembly models, where red and blue arrows represent sticky ended dimeric coiled coil peptides and black arrows represent peptides for introducing structural features into the nanofiber morphology. Adapted from Ref. 51, Copyright 2006, with permission from Elsevier.