Related by context. Frequent words. (Click for all words.) 67 Embryos 61 Embryonic Stem Cells 60 blastocysts 60 oocytes 59 undifferentiated cells 59 cloned embryos 59 blastocyst 59 cryopreserved 59 mouse embryos 58 Autologous 58 embryo 58 somatic cell 58 Embryonic 58 blastocyst stage 57 embryos 57 Adult Stem Cells 57 teratomas 56 IVF embryos 56 unfertilized eggs 56 somatic cells 56 Embryo 56 myoblasts 55 cloned embryo 55 mesenchymal cells 55 fibroblast cells 55 unfertilized human 55 stem cells 54 Mammalian 54 extract stem cells 54 iPSCs 54 umbilical cord stem cells 54 pancreases 54 genetically engineered mouse 54 vitro fertilization clinics 54 Brain Cells 54 oocyte 54 Stem Cells 53 Human Embryonic Stem 53 SCNT 53 Cancer Cells 53 extracted stem cells 53 iPS cell 53 Fetuses 53 chimeras 53 unused embryos 53 leftover embryos 53 unfertilized egg 53 germ cells 53 unfertilized 53 ES cells 53 iPS 53 pancreatic islet cells 53 pluripotent stem cells 53 stem cells derived 52 fertilized embryos 52 transplanted stem cells 52 fertilized eggs 52 Chromosomes 52 ESCs 52 Implantation 52 hES cells 52 follicle stimulating hormone 52 transgenic mouse 52 pluripotent cells 52 cells hESCs 51 induced pluripotent stem iPS 51 Inhibits 51 somatic cell nuclear 51 Cloned 51 peripheral blood mononuclear 51 Adult stem cells 51 granulocytes 51 Embryonic stem cells 51 fetal stem cells 51 HeLa cells 50 Monoclonal Antibody 50 Scientists Identify 50 mice lacking 50 gametes 50 embryonic stem cells 50 fetal tissue 50 Stem cells 50 imprinted genes 50 hESCs 50 Transfusions 50 embryonic cells 50 human embryos 50 extracting stem cells 50 overexpressing 50 overexpress 50 Ovarian 50 neural stem cells 49 induced pluripotent stem cells 49 preimplantation genetic diagnosis 49 stem cell colonies 49 ovarian tissue 49 endothelial progenitor cells 49 cell transplantation 49 epididymis 49 Shinya Yamanaka 49 bone marrow stem cells