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. 2017 Apr 18;5:34. doi: 10.1186/s40425-017-0236-3

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. 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.

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Fig. 1 — Image of patient’s bone marrow biopsy, confirming metastatic melanoma to bone with corresponding PD-L1 staining. Panel a shows images of the patient’s bone marrow with extensive involvement by metastatic melanoma. Panel b shows corresponding bone marrow sample with tumor cells staining positive for PD-L1 (Vendor: Cell signal, Clone: E1L3N, Dilution: 1:500)