THP1 cells were cultured in RPMI 1640 medium supplemented with 10% fetal bovine serum (FBS), 2 mM l-glutamine, streptomycin (100 μg/ml), and penicillin (100 U/ml) at 37°C in 5% CO2. SS or G0 THP1 cells were prepared by washing with phosphate-buffered saline (PBS) followed by serum starvation at a density of 2 × 105 cells/ml. AraC-treated cells were prepared by treatment with indicated concentrations of AraC for indicated periods of time. THP1 (TIB-202) and monocytes (CRL9855) were obtained from the American Type Culture Collection (ATCC). NOMO1 and MOLM13 were obtained from ATCC and from the Scadden group (1 (link)). Cell lines were tested for mycoplasma (Promega) and authenticated by the ATCC Cell Authentication Testing Service (1 (link)).