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. 2022 Feb 7;9:777320. doi: 10.3389/fbioe.2021.777320

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Copyright © 2022 Wang, Liang, Huang, Gao, Xu, Ni, Yang, Yang and Zhao.

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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Optical images of dyed silkworm silk from different sources, degummed by Na₂CO₃ with different concentration (A–F) and epivisal viscosity (G), *p < 0.05. Silk from Jiangsu degummed by 0.05% Na₂CO₃ (A) and 0.5% Na₂CO₃ (B); no degumming treatment (C). Silk from Zhejiang degummed by 0.05% Na₂CO₃ (D) and 0.5% Na₂CO₃ (E); no degumming treatment (F).