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. 2021 Feb 6;21:125. doi: 10.1186/s12885-021-07833-5

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© The Author(s) 2021

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. 1 — Side population (SP) cells form subpopulation in multiple myeloma (MM) cell lines. a and c SP cells were isolated in RPMI-8226 and NCI-H929 cells using Hoechst 33342 fluorescence staining method with fluorescence-activated cell sorting (FACS). b and d Expression of SP cell surface markers including aldehyde dehydrogenase 1 (ALDH1) and sex determining region Y (SRY)-box 2 Sox2 were measured using quantitative reverse transcription-polymerase chain reaction (qRT-PCR). ***P < 0.001