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Coiled coil nanotubes based upon peptides inspired by TolC protein, designed by Conticello and coworkers. a) 29-amino acid peptide sequences in two forms, one having arginines in the positions indicated (Form I) and the other containing lysines in those positions (Form II). CryoTEM image (b) and 3D structure (d) of Form I nanotubes; cryoTEM image (c) and 3D structure (e) of Form II nanotubes. Adapted from Ref. 60, Copyright 2006, with permission from Elsevier.
