Self-assembly of highly asymmetric ELPs with a short (XGz)8 assembly domain. a) Schematic of ELP asymmetric amphiphiles, where n is the number of pentameric repeats, X is an aromatic hydrophobic amino acid (Tyr, Phe, or Trp) responsible for driving self-assembly and z is the number glycine residues (G). b) Cryo-TEM micrographs of (VPGAG)160-(FGG)8 shows that this asymmetric amphiphile assembles into cylindrical micelles. Scale bar represents 200 nm. Reproduced with permission.[71] Copyright 2014, American Chemical Society.