chromatin condensation 14 article 12 human 10 human cell 10 priority journal 10 controlled study 8 male 8 nonhuman 8 Animals 6 Apoptosis 6 apoptosis 6 immunocytochemistry 6 in vitro study 6 protein bcl 2 6 protein secretion 6 signal transduction 6 Cell Line, Tumor 4 Heparan sulfate 4 Manganese 4 Protamine 4 Sperm nuclear decondensation 4 animal cell 4 carbohydrate analysis 4 caspase 3 4 caspase 7 4 caspase 9 4 cell isolation 4 cell structure 4 cell viability 4 drug activity 4