The CCRF-CEM leukemia cells were kindly provided by Prof. Axel Sauerbrey (Department of Pediatrics, University of Jena, Jena, Germany) [29]. The cell lines were authenticated using Multiplex Cell Authentication (MCA) based on single-nucleotide polymorphism profiling by Multiplexion GmbH (Heidelberg, Germany) as previously detailed [30]. Those cell lines have been in culture for 14 years.
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