RPMI-8226, NCI-H929, U266, HEK293T/17 and HS-5 were purchased from ATCC. KMS-11 and MOLP-8 were a kind gift from Professor H. Johnsen (Aarhus University Hospital, Denmark). GFP-tagged bone marrow stromal cells, HS-5-GFP, were generated as previously described [29 (link)]. HEK293T/17 and HS-5-GFP cells were cultured in DMEM containing GlutaMAX™ and 10% FBS (Life Technologies). All other cells were cultured in RPMI-1640 containing GlutaMAX™ and 10% FBS. All cells tested negative for mycoplasma by PCR and were authenticated by STR analysis.