Related by context. Frequent words. (Click for all words.) 87 embryo 80 human embryos 77 frozen embryos 66 embryonic stem cells 65 stem cells 65 embryonic cells 65 vitro fertilization 64 IVF 63 therapeutic cloning 63 stem cell 63 fertility clinics 60 adult stem cells 60 embryonic stem cell 58 cloning 58 fertilized egg 57 sperm 57 PGD 57 fertility treatments 57 human embryonic stem 57 fetuses 56 human cloning 55 umbilical cord blood 55 ovaries 54 fertility clinic 54 ovary 53 adult stem cell 52 HFEA 52 eggs 52 stem cell research 51 cord blood 51 embryonic 51 iPS cells 50 artificial insemination 49 fetus 49 Embryonic stem cells 49 amniotic fluid 48 fertilization 48 follicles 48 Cloning 48 infertile 48 vitro 48 surrogacy 47 fertilized 47 Human Fertilisation 47 unborn babies 47 Fertility 47 cloned 46 Stem cell 46 Stem cells 46 organs 46 wombs 46 pregnancies 45 unborn 45 fertility 45 insulin producing 45 livers 45 infertility 45 tissue 45 organ transplants 45 babies 44 egg 44 tissue samples 44 Stem Cell Research 44 transplants 44 bone marrow transplants 44 transplantation 44 Stem Cell 44 uterus 44 Bioethics 43 transgenic 43 offspring 43 bone marrow 43 genetic modification 43 womb 42 piglets 42 clones 42 sonogram 42 Reproductive Medicine 42 ultrasounds 42 abortions 42 ovarian 42 cloned animals 42 chromosomes 41 genetically 41 implantation 41 stem cell therapy 41 Sperm 41 corneas 41 genetically modified 41 ethicists 41 abortion 41 biopsies 41 Kamrava 40 testes 40 heifers 40 bioethics 40 fetal 40 grafts 40 cells 40 stem cell transplant 40 transfusions