Related by context. Frequent words. (Click for all words.) 70 human embryos 68 cloned embryos 67 therapeutic cloning 66 human cloning 66 Embryonic stem cell 65 cloning 65 embryonic stem cells 64 destroying embryos 62 reproductive cloning 62 embryos 62 embryonic stem cell 61 somatic cell nuclear 60 embryonic cells 60 human embryonic stem 59 stem cell research 59 stem cells 59 embryo 58 stem cell 57 stem cells derived 57 fetal tissue 56 adult stem cells 55 Cloning 54 fertilized eggs 53 vitro fertilization 53 pluripotent stem cells 52 Stem cell 52 Embryos 51 Embryo 51 induced pluripotent stem cells 51 Adult stem cells 51 adult stem cell 51 Embryonic stem cells 50 frozen embryos 50 genetic manipulation 50 vitro fertilization IVF 50 iPS cells 50 Embryology Authority 50 cloned 50 IVF 50 parthenogenesis 50 genetically engineered 49 oocytes 49 stem cell therapies 49 fertilized egg 49 recombinant DNA 49 Stem Cell Research 48 infertile couples 48 fertility clinics 48 embryonic 48 fertility treatments 47 genetically altered 47 assisted reproduction 47 ES cells 47 blastocysts 47 scientist Hwang Woo 47 genetically modified 47 HFEA 46 infertility treatments 46 ovarian tissue 46 bone marrow stem cells 46 artificial insemination 45 umbilical cord blood 45 genetic modification 45 Advanced Cell 45 Stem Cell 45 geneticists 45 gene therapy 45 pluripotent 45 hESCs 44 biomedical research 44 genetically identical 44 donor sperm 44 PGD 44 Human Fertilisation 44 ova 44 Stem cells 44 genetic defects 43 blastocyst 43 eugenics 43 transgenic 43 bioethicists 43 Embryonic 43 stem cell therapy 43 umbilical cords 43 genetically matched 43 Cord blood 43 Embryology 43 virgin birth 43 embryos implanted 43 implanting 42 Hwang Woo suk 42 sperm 42 ethicists 42 gene sequencing 42 bioethics 42 stem cell biology 42 germ cells 42 scientific 42 Stem Cells 42 insulin producing 42 synthetic biology