Related by context. Frequent words. (Click for all words.) 64 oocyte 62 ovum 61 oocytes 61 sperm 59 embryos 58 fertilized eggs 57 embryo 57 sperms 56 germ cells 55 ova 55 Embryos 54 cloned embryo 53 somatic cells 52 donor sperm 52 hermaphrodites 51 fertilized egg 51 fertilized embryos 51 Embryo 51 zygote 50 chimeras 50 procreative 50 ovary 50 blastocyst 50 stem cells 49 cloned embryos 49 human embryos 49 blastocysts 49 placentas 49 pluripotent stem cells 49 therapeutic cloning 48 hematopoietic stem cells 48 offspring 48 mouse embryos 48 eggs 48 sperm donors 48 somatic cell nuclear 47 fertilization 47 parthenogenesis 47 fetal tissue 47 testis 47 meiosis 46 frozen embryo 46 embryonic cells 46 iPS 46 Embryology Authority HFEA 46 artificial insemination 46 X chromosomes 46 organs 46 embryonic stem cells 46 reproductive cloning 45 procreation 45 organism 45 ESCs 45 genetically identical 45 Embryology Authority 45 reproductive tract 45 amniotic fluid 45 Embryonic stem cells 45 assisted reproduction 45 umbilical cords 45 infertile couples 45 ovarian tissue 45 HSCs 45 procreate 45 neural stem cells 45 SCNT 44 testes 44 ovaries 44 IVF 44 frozen embryos 44 hESCs 44 umbilical cord blood 44 surrogate mothers 44 ES cells 44 Adult stem cells 44 vitro fertilization IVF 43 Sperm 43 mammalian cells 43 insemination 43 reproductive 43 wombs 43 iPS cells 43 hepatocytes 43 reproductive organs 43 pluripotent 43 hESC 43 iPSCs 43 cord blood 43 zebra fish 43 Embryonic 43 progenitor cells 43 allogeneic 42 fertilized 42 islet cells 42 transgenic animals 42 vitro fertilization 42 chromosomes 42 hormone estrogen 42 matings 42 HFEA 42 IVF clinics