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Bakar, S. , Zawawi, M. , Ali, A. , Ideris, A.. "Induction of Apoptosis by Newcastle Disease Virus Strains AF220 and V4-UPM in Human Promyelocytic Leukemia (HL60) and Human T-Lymphoblastic Leukemia (CEM-SS) Cells". World Academy of Science, Engineering and Technology, Open Science Index 64, International Journal of Bioengineering and Life Sciences, (2012), 6(4), 135 - 139.