Related by context. Frequent words. (Click for all words.) 72 embryo 70 blastocysts 65 embryos 62 oocytes 59 germ cells 59 cloned embryos 57 Embryos 56 ovary 56 fertilized egg 55 fertilized eggs 55 embryonic cells 55 follicles 53 stem cells 52 embryonic 52 testis 52 somatic cell nuclear 51 ovaries 50 ES cells 50 human embryos 50 fertilization 50 progenitor cells 49 ovarian tissue 49 parthenogenesis 48 hESCs 48 embryonic stem cells 48 fetuses 48 neural stem cells 48 chromosomes 48 chromosomal abnormalities 47 stem cell 47 conception 47 Embryonic stem cells 47 implantation 47 cardiomyocytes 47 cultured cells 47 womb 47 retinal cells 46 fetus 46 therapeutic cloning 46 follicle 46 pluripotent 46 bone marrow stem cells 46 ovulate 46 thymus 46 mesenchymal stem cells 46 vitro fertilization IVF 46 reproductive cloning 46 IVF 46 fibroblasts 46 Embryo 46 fertilized 46 placental 45 endometrium 45 sperm 45 melanocytes 45 hematopoietic stem cells 45 genetically identical 45 testes 45 induced pluripotent stem cells 45 frozen embryos 45 autoantibodies 45 hepatocytes 45 ovarian 45 X chromosomes 45 cells 44 mitosis 44 iPS cells 44 uterus 44 epithelial cells 44 islet cells 44 placentas 44 PGD 44 embryos implanted 44 CD# + [002] 44 ova 44 vitro fertilization 44 fetal 44 genetic alterations 44 adipose tissue 44 vitro 44 benign tumors 43 adult stem cells 43 ovulation 43 hair follicles 43 bilirubin 43 glial cells 43 endothelial cells 43 tumor 43 colostrum 43 transgenic mice 43 gestational 43 yeast cells 43 embryology 43 breast tissue 43 gestation 43 epidermis 43 miRNAs 43 pluripotent stem cells 43 destroying embryos 43 tumors 42 metastases