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. 2023 May 30;14:1136727. doi: 10.3389/fimmu.2023.1136727

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Copyright © 2023 Yang, Yuan and Ma

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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Cell culture and staining identification. (A) Cells 7 days after inoculation. (B) Cells 21 days after inoculation. (C) Safranine O staining of NP cells (×200). (D) Toluidine blue staining of NP cells (×200).