(A) THP-1 cells were co-cultured with MSC for 24 hours and then were treated with vehicle, 30 ug/ml CBP.001, 1 uM AraC, or combination of both agents at single agent dose for 48 hours and then adherent AML cells were isolated. Flow cytometry was performed to determine (A) total viable THP1 cells (CD90-/Annexin V-/DAPi-) and (B) % apoptotic cells (CD90-/Annexin V +). For A & B, data represents average of three different replicates. Student t-test comparison of groups compared to control (untreated) determined a significant difference in all treated groups (**, p < 0.01).