Related by context. Frequent words. (Click for all words.) 67 germ cells 66 embryo 65 embryos 62 islet cells 62 sperm 62 ES cells 61 neural stem cells 61 stem cells 60 ovarian tissue 60 cloned embryos 60 ovary 59 Embryos 59 fertilized eggs 59 ovaries 58 follicles 58 ova 57 mutant mice 57 pluripotent stem cells 56 bone marrow stem cells 56 iPS cells 56 fibroblasts 55 transgenic mice 55 mesenchymal stem cells 55 vitro 55 adipose tissue 55 progenitor cells 55 ex vivo 55 mammalian cells 54 ovarian 54 testis 54 testes 54 thymus 53 colostrum 53 knockout mice 53 embryonic cells 53 autologous 53 somatic cell nuclear 53 NK cells 52 Adult stem cells 52 umbilical cord blood 52 adult stem cells 52 cryopreservation 51 lymphocytes 51 placental 51 parthenogenesis 51 skeletal muscle 51 stem cells derived 50 genetically engineered mice 50 vitro fertilization IVF 50 chromosomal abnormalities 50 embryonic 50 yeast cells 50 placentas 50 fertilization 50 embryonic stem cells 50 transgenic 50 fertilized egg 50 mRNA 49 MSCs 49 Embryo 49 induced pluripotent stem cells 49 stem cell transplantation 49 tumor cells 49 progesterone 49 miRNAs 49 assisted reproduction 49 tissue 49 tissues 49 endothelial cells 49 IVF 49 frozen embryos 49 pluripotent 49 eggs 49 transplantation 49 neurogenesis 48 methylation 48 adiponectin 48 antigen 48 zebrafish 48 insemination 48 amniotic fluid 48 antibodies 48 livers 48 epithelial cells 48 allograft 48 gene expression 48 cells 48 genetic abnormalities 48 mice 48 implantation 48 cord blood 48 choline 48 human embryos 48 genetically identical 48 melanocytes 48 stem cell 48 vivo 47 Sperm 47 ovulation 47 thyroid hormone 47 mtDNA