Related by context. Frequent words. (Click for all words.) 57 unfertilized eggs 56 leftover embryos 55 unfertilized egg 54 cloned embryos 54 fertilized embryos 53 cloned embryo 52 donor sperm 52 embryo 52 fetal tissue 51 unused embryos 51 vaginal secretions 50 fertilized eggs 50 embryos 50 vitro fertilization 50 human embryos 50 induced pluripotent stem iPS 50 ovaries 49 SCNT 49 cloned stem cells 49 ovarian tissue 49 ovum 49 gametes 48 ethically acceptable 48 Fallopian tubes 48 premature menopause 48 somatic cell nuclear 48 infertility 48 mouse embryos 48 ovary 48 preimplantation genetic diagnosis 48 stem cell colonies 48 oocytes 47 hormone progesterone 47 oocyte 47 fetal stem cells 47 terminating pregnancy 47 uterine lining 47 extracting stem cells 47 fertilized egg 46 hormones estrogen 46 pluripotent cells 46 Therapeutic cloning 46 Embryos 46 infertility treatments 46 chimeras 46 uterus 46 fertility treatments 46 Embryology Act 46 destroying embryos 46 vitro fertilization clinics 46 donor insemination 46 vitro fertilization IVF 46 Chipped offAussies set 46 extract stem cells 46 human cloning 46 germ cells 46 ova 46 embryos implanted 46 fallopian tubes 46 infertile 46 IVF treatment 46 embryonic cells 45 umbilical cord stem cells 45 human reproductive cloning 45 estrogen hormone 45 artificial insemination 45 transgenic animal 45 embryo transfers 45 fetu 45 milk ducts 45 conceiving 45 pre implantation genetic 45 ESCs 45 terminate pregnancies 45 parasitic twin 45 hematopoietic cell 45 fallopian tube 45 cancerous breast 45 assisted reproduction 45 uterine wall 45 womb 45 IVF 45 sperms 45 chorionic villus sampling 45 sperm 44 infertile couples 44 Embryo 44 iPS cell 44 spontaneous abortions 44 ovaries removed 44 genetic defects 44 Embryonic stem cell 44 therapeutic cloning 44 With Zions Direct 44 undergoing IVF 44 reproductive cloning 44 facilitates umbilical cord 44 terminate pregnancy 44 surrogate motherhood 44 transplantable 43 undifferentiated cells