CXCR4 and lymphoma: Given the fact that Jurkat cells, which are generally used for the determination of CXCR4 affinity, are not tumorigenic in mice and to ensure comparability of data with previous studies (Poschenrieder et al. 2016a; Wester et al. 2015; Schottelius et al. 2015), the Daudi lymphoma model was also used in this study.