Related by context. Frequent words. (Click for all words.) 77 Stem cell 76 embryonic stem cell 71 stem cell research 70 human embryos 67 embryonic stem cells 65 human embryonic stem 64 stem cell 64 embryonic cells 61 therapeutic cloning 61 human cloning 58 adult stem cells 57 adult stem cell 56 cloned embryos 56 stem cell therapies 55 Stem Cell Research 55 stem cells derived 55 embryo 55 stem cells 55 embryos 55 cloning 53 Cloning 52 Embryonic stem cells 50 Stem cells 50 Abortion 48 Stem Cell 48 embryonic 48 stem cell therapy 48 gene therapy 47 frozen embryos 46 regenerative medicine 46 vitro fertilization 46 biomedical research 46 fertility clinics 45 fertility treatments 45 Same sex 45 cures 45 abortion 45 gay marriage 44 debilitating diseases 44 organ transplants 44 Advanced Cell 43 assisted suicide 43 IVF 43 incurable diseases 43 infertile couples 43 vitro fertilization IVF 43 bioethics 43 stem cell transplantation 43 genetic modification 43 iPS cells 43 stem cell transplants 43 assisted reproduction 42 synthetic biology 42 Abortion opponents 42 fertilized egg 42 Euthanasia 41 Affirmative action 41 unborn babies 41 comparative effectiveness 41 Bioethics 41 genetically modified crops 41 banning gay marriage 41 aborted fetuses 41 Geron 41 epigenetics 41 organ transplantation 40 genetically engineered 40 unborn 40 Terri Schiavo 40 genetically engineered crops 40 abortions 40 Infertility 40 partial birth 40 pro lifers 40 genetic manipulation 40 biotechnology 39 sex marriage 39 genetically modified foods 39 genetically modified 39 StemCells 39 fertilized eggs 39 scientific discoveries 39 Partial Birth Abortion Ban 39 bone marrow transplants 39 Contraception 39 biotech 39 Third Frontier 39 Global warming 39 Regenerative Medicine 38 bone marrow transplantation 38 scientific breakthroughs 38 umbilical cord blood 38 euthanasia 38 terminate pregnancy 38 Eminent domain 38 nanotechnology 38 transplantation 38 ObamaCare 38 oocytes 38 PGD 37 organ transplant