G1 Phase article 14 controlled study 12 human 12 priority journal 12 Cell Line, Tumor 10 Cell cycle 10 Humans 10 S Phase 10 cell cycle G1 phase 10 cell cycle S phase 10 human cell 10 protein expression 10 Animals 8 Apoptosis 8 apoptosis 8 cell cycle 8 neuroblastoma cell 8 Cell Cycle 6 Cell Differentiation 6 Cyclin-Dependent Kinase Inhibitor p27 6 DNA 6 Mice 6 P27kip1 6 Phosphorylation 6 Western blotting 6 animal cell 6 cell cycle progression 6 cell differentiation 6 cell proliferation 6