Related by context. Frequent words. (Click for all words.) 75 embryos 68 embryo 62 Embryos 62 fertilized eggs 60 cloned embryos 59 frozen embryos 59 human embryos 58 ovarian tissue 57 stem cells 56 IVF 56 Embryo 55 PGD 55 genetic abnormalities 55 fertility clinics 55 embryonic cells 53 ovary 53 sperm 53 sperm donors 53 embryonic stem cells 52 genetic defects 52 oocytes 52 fertility treatments 52 assisted reproduction 52 vitro fertilization 51 fertilized egg 51 infertile couples 51 Embryology Authority 51 vitro fertilization IVF 51 placentas 50 germ cells 50 infertile 50 stem cell 50 donor organs 50 fertility clinic 50 adult stem cells 49 bone marrow stem cells 49 neural stem cells 49 embryonic stem cell 49 pluripotent stem cells 49 transplants 48 HFEA 48 amniotic fluid 48 umbilical cords 48 ovaries 48 wombs 48 ES cells 48 fetuses 48 human embryonic stem 47 islet cells 47 livers 47 infertility 47 vCJD 47 assisted reproductive 47 amniocentesis 47 fertilized 47 ovaries removed 47 umbilical cord blood 47 fetus 47 ova 47 genetically identical 47 therapeutic cloning 46 organs 46 surrogate mothers 46 follicles 46 offspring 46 newborns 46 bone marrow transplants 46 fertility 46 tissue 46 genetic disorders 46 genetic 45 Human Fertilisation 45 babies 45 organ transplants 45 genetically 45 eggs 45 iPS cells 45 Down syndrome 45 pregnancies 45 Embryonic stem cells 45 cloning 45 bone marrow 45 unborn babies 45 tissue samples 44 cord blood 44 bioethicists 44 corneas 44 embryonic 44 tumors 44 reproductive cloning 44 insulin producing 44 defective gene 44 stem cells derived 44 somatic cell nuclear 44 womb 44 induced pluripotent stem cells 43 newborn babies 43 uterus 43 premature babies 43 genetic defect 43 transgenic mice