Fig. 8. Extra-cellular Lactate Dehydrogenase (LDH) assay of HL-60 were measured prior freezing [Control]. Cells were frozen in DMSO + Nig and Sal and LDH activity were measured 1 hour post thaw in RPMI media only [DMSO], RPMI +Nig (150 µM) + Sal (100 µM) [DMSO + Nig/Sal]. Extracellular LDH activity (mU/ml) and data are presented as a mean [n=5 replicates] ± SEM (* P value < 0.05).