article cell differentiation human 62 human cell controlled study 54 priority journal 48 Humans 43 Cell Differentiation 38 protein expression 28 signal transduction 19 Animals 17 Signal Transduction 17 unclassified drug 16 Mice 15 apoptosis 15 cell maturation 15 Apoptosis 13 cell proliferation 13 mouse 13 Cell Line, Tumor 12 Erythropoietin 12 Tumor Cells, Cultured 12 animal cell 12 cyclic AMP 12 erythropoietin 12 leukemia cell 12 nonhuman 12 Blotting, Western 11 cell culture 11 cell growth 11