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. 2021 Jun 9;9:630977. doi: 10.3389/fbioe.2021.630977

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Copyright © 2021 Zhou, Chen, Ding, Hu, Cen and Zhang.

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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Cross-section morphology of lyophilized Col/PVA dual-layer membranes after being immersed in PBS for (A) 4 days, (B) 8 days, (C) 12 days, (D) 17 days, and the corresponding magnified images of collagen layer at (E) 4 days, (F) 8 days, (G) 12 days, (H) 17 days.