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. 2021 Mar 11;12:635677. doi: 10.3389/fimmu.2021.635677

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Copyright © 2021 Li, Wang, Chen, Sun, Du, Wang, Ding, Jia, Wang 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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Stability evaluation of the strip. The sensitivities of fresh strips (left) and strips after 6 months of storage (right) were determined. 1–9: The SARS-CoV-2 RBD protein produced in this study diluted ranging from 4,000 to 62.5 ng/mL by two times ratio; N: PBS negative control.