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Bioinspiration: Polar assembly (a feature of many natural protein-based fibrous structures, such as actin, microtubules, intermediate filaments, and collagens) is demonstrated in a straightforward, synthetic, peptide-based fiber system of de novo design (see false-color confocal-microscope image of fibers). This finding opens up possibilities for engineering self-assembling soft materials from the bottom up and with nano-to-microscale precision.
Smith et al. (Tue,) studied this question.