Related by context. Frequent words. (Click for all words.) 63 umbilical cord 61 umbilical cord blood 54 stem cells derived 52 cord blood 49 amniotic fluid 49 stem cells 47 embryos 46 oocytes 45 sperm 45 fertilized eggs 44 adult stem cells 43 fertility clinics 43 frozen embryos 42 fertility treatments 42 embryonic cells 42 wombs 42 embryonic stem cells 42 cloned embryos 42 human embryos 42 vitro fertilization IVF 41 stem cell 41 tissue 41 vitro fertilization 41 aborted fetuses 41 sperm donors 40 womb 40 scalpels 40 umbilical 40 tissue samples 40 embryo 39 placenta 39 therapeutic cloning 39 amniocentesis 39 newborns 39 fetuses 39 grafts 38 Stem cells 38 corneas 38 marrow 38 babies 38 tissues 38 fallopian tubes 38 organs 37 newborn babies 37 stem cell transplants 37 IVF 37 premature babies 37 livers 37 conjoined twins 37 neonates 37 islet cells 37 fertilized egg 37 transfusions 37 autologous 37 forceps 36 embryonic stem cell 36 assisted reproduction 36 Embryonic stem cells 36 adult stem cell 36 uterus 36 contraceptives 36 Cord Blood 36 foreskin 36 Sperm 36 stem cell transplantation 36 ovary 36 bone marrow transplants 35 neural stem cells 35 sutures 35 transplants 35 Stem cell 35 infants 35 fertilized 35 ovaries 35 stem cell research 35 adipose tissue 35 fetus 35 organ transplants 35 specimens 35 transfusion 34 spinal cords 34 stem cell therapies 34 newborn 34 Newborns 34 surrogate mother 34 blood platelets 34 donor organs 34 Caesarean 33 pregnancies 33 human embryonic stem 33 breast milk 33 embryonic 33 incubators 33 needles 33 progenitor cells 33 blood 33 cadavers 33 cervix 33 transplantation 33 spinal fluid 33 parental consent