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. 2020 Mar 20;8:231. doi: 10.3389/fbioe.2020.00231

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Copyright © 2020 Sogawa, Nakano, Tateishi, Tajima and Numata.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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FE-SEM images showing the surface of silk fibers at different magnifications. (a,b) Native Nephila spider dragline. (c,d) Nephila spider dragline after ether extraction.