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. 2022 Jan 6;20:22. doi: 10.1186/s12951-021-01227-2

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© The Author(s) 2022

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 5 — Lymph node mapping in mice injected with alloy QDs. MQDs or alloy QDs were injected into the footpad of the mice. The fluorescence signal in the injected QDs was observed in the injection site, and the injected QDs were delivered to lymph node site via lymphatic vessels. Fluorescence signals were observed only in the alloy-QD-injected group 1 h and 24 h after injection. Fluorescence signal in alloy QDs was markedly observed in the popliteal lymph node