Related by context. Frequent words. (Click for all words.) 50 cloned embryos 50 cloned 50 cloning 46 somatic cell nuclear 45 embryo 45 Dolly 43 parthenogenesis 43 human embryos 42 scientific breakthroughs 41 human cloning 41 embryos 41 SCIENTISTS 41 stem cells 41 Clonaid 40 Cloning 40 SCNT 40 pluripotent stem cells 40 destroying embryos 40 embryonic stem cells 40 Embryos 40 reproductive cloning 39 chimeras 39 human embryonic stem 39 therapeutic cloning 39 microchip 39 recombinant DNA 39 fertilized eggs 38 assisted reproductive 38 vitro fertilization 38 stem cell therapy 38 embryology 38 stem cell 38 scientific discoveries 38 fertilized egg 38 iPS cells 38 vitro fertilization IVF 38 Hwang Woo suk 38 conjoined twins 38 Embryonic stem cells 38 Embryonic stem cell 38 embryonic cells 38 artificial insemination 37 embryonic 37 scientists 37 selective breeding 37 genetically engineered 37 ovarian tissue 37 geneticists 37 IVF 37 ovaries 36 crossbreed 36 blastocyst 36 mad cow disease 36 gene therapy 36 reproductive biology 36 virgin birth 36 regenerative medicine 36 embryos implanted 36 Craig Venter 36 assisted reproduction 36 oocytes 36 cloned animals 36 genetic defects 36 germ cells 35 transgenic 35 Embryo 35 biotechnology 35 stem cells derived 35 artificially inseminated 35 infertility treatments 35 ovary 35 adult stem cells 35 genetically altered 35 bovine spongiform encephalopathy BSE 35 Geron Corporation 35 stem cell research 35 fetal tissue 35 ruminants 35 islet cells 35 Booger 35 induced pluripotent stem cells 35 birth 35 Advanced Cell 35 adult stem cell 35 pancreatic cells 34 cows pigs 34 synthetic biology 34 panda cub 34 blastocysts 34 HFEA 34 Stem cell 34 offspring 34 physicists 34 conceive 34 ruminant 34 genome sequence 34 wombs 34 genetics 34 Embryonic 34 genetic sequencing 34 birth defect