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AFM height images of (a) peptide amphiphile 1 alone (heights = 5.3 ± 0.6 nm) or (b) 200:1 molar ratio mixture of 19 and 20 showed no fibers and (c) QFDE TEM of 200:1 molar ratio mixture of 19 to 20 revealing the aspect ratio of the small aggregates. Reproduced with permission from ref 55. Copyright 2008 American Chemical Society.
