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. 2022 Nov 22;9:1059624. doi: 10.3389/fmed.2022.1059624

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Copyright © 2022 Liu, Li, Wang, Liu, Wong, Zhou and Wang.

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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Longitudinal sections; expression of HK31 in the normal nail unit and onychopapilloma. (A) Normal nail matrix (DAB staining, SP, ×400). (B) Normal nail bed (DAB staining, SP, ×400). (C) Nail bed of onychopapilloma (DAB staining, SP, ×400).