Related by context. Frequent words. (Click for all words.) 62 stem cells 62 embryonic stem cells 60 cloned embryos 60 stem cell 60 iPSCs 59 induced pluripotent stem iPS 59 pluripotent stem cells 59 iPS cell 58 embryonic cells 58 pluripotent cells 58 ES cells 57 iPS cells 57 stem cells derived 56 ESCs 56 embryos 55 somatic cell 55 mouse embryos 55 embryo 55 bone marrow stem cells 55 cloned embryo 55 transgenic mice 55 adult stem cells 55 hESCs 55 neural stem cells 54 somatic cell nuclear 54 neural stem cell 54 RPE cells 54 genetically modified mice 54 induced pluripotent stem cells 54 cryopreserved 54 unfertilized egg 54 reprogrammed cells 54 leftover embryos 54 extract stem cells 54 human embryos 53 chimeras 53 germ cells 53 mouse embryo 53 transgenic animals 53 retinal cells 53 SCNT 53 cultured cells 53 fetal tissue 53 hESC 53 Adult stem cells 52 embryonic stem cell 52 therapeutic cloning 52 human embryonic stem 52 exosomes 52 stem cell colonies 52 somatic cells 52 genetically manipulated 52 progenitor cell 51 genetically engineered mice 51 oocytes 51 mouse embryonic stem 51 pancreatic cells 51 transgenic animal 51 oocyte 51 zebra fish 51 embryonic 51 genetically altered mice 51 biological molecules 50 human neural stem 50 Caenorhabditis elegans 50 stromal cells 50 fertilized embryos 50 cardiomyocytes 50 unfertilized eggs 50 iPS 50 genetically identical 50 RNA molecule 50 unused embryos 50 chimeric 49 PrP 49 adult stem cell 49 Th# cells 49 progenitor cells 49 mesenchymal stem cells 49 cells 49 islet cells 49 gametes 49 Zebrafish 49 blastocysts 49 myoblasts 49 naturally occurring proteins 49 nonhuman primates 49 mammalian brain 49 stem cell therapies 49 gene splicing 48 pancreatic islet cells 48 prion proteins 48 hematopoietic stem cells 48 zebrafish 48 vitro 48 pluripotent 48 cloned 48 neuronal cells 48 HHMI investigator 48 stem cell biology 48 HSCs