Related by context. Frequent words. (Click for all words.) 72 human cloning 72 embryonic stem cells 71 human embryos 68 embryonic stem cell 67 stem cell research 65 stem cell 65 cloning 64 human embryonic stem 63 embryos 62 adult stem cells 62 stem cells 61 embryo 61 adult stem cell 58 iPS cells 57 Stem Cell Research 55 Stem cell 54 Cloning 54 vitro fertilization 53 IVF 53 regenerative medicine 51 frozen embryos 50 embryonic 49 stem cell therapy 49 surrogacy 49 fertility clinics 49 Stem Cell 49 fertility treatments 48 genetic modification 48 organ transplants 48 fertilized egg 47 gene therapy 46 genetically modified 46 euthanasia 46 gay marriage 45 assisted suicide 45 civil unions 45 bioethics 45 partial birth 45 abortion 45 abortions 45 commercial whaling 44 biomedical research 44 sex marriage 44 artificial insemination 44 synthetic biology 43 genetically engineered 43 Stem Cells 43 RNA interference 43 sex marriages 42 genetically modified crops 42 bone marrow transplants 42 gay marriages 42 Stem cells 42 Bioethics 42 transgenic 42 Advanced Cell 42 cloned animals 42 ethicists 41 Abortion 41 biotechnology 41 cloned 41 organ donation 41 legalizing gay marriage 41 homosexual couples 40 contraception 40 translational research 40 genetically altered 40 fertility clinic 40 transplantation 40 insulin producing 39 banning gay marriage 39 geneticists 39 comparative effectiveness 39 telomerase 39 beef imports 39 umbilical cord blood 39 unborn babies 39 genomics 39 Marriage Amendment 39 gay couples 39 proteomics 39 Geron 38 biotech crops 38 Regenerative Medicine 38 reproductive 38 legalized abortion 38 flu vaccines 38 cures 38 procreation 38 emergency contraception 38 personalized medicine 38 DNA sequencing 38 International Whaling Commission 38 decriminalization 38 cord blood 38 eugenics 37 GMOs 37 sex couples 37 vaccines 37 legalize gay marriage 37 vaccine