Figure 2.

Transmission electron micrograph (TEM) of nanofibers formed from peptide amphiphile molecules (N terminus – C₁₀H₁₉O and Peptide – CCCCGG GS^(PO4)RGD) that self-assembled by drying directly onto a TEM grid without adjusted pH (negatively stained with phosphotungstic acid). The morphology of the nanofibers was similar to that observed by pH-induced self-assembly. Source: Hartgerink JD, Beniash E, Stupp SI. 2002. Peptide-amphiphile nanofibers: a versatile scaffold for the preparation of self-assembling materials. Proc Natl Acad Sci U S A, 99:5133–8. Copyright © 2002 National Academy of Sciences, USA. Reprinted with permission of the National Academy of Sciences, USA.