Related by context. Frequent words. (Click for all words.) 70 Embryo 68 embryos 65 embryo 60 cloned embryos 60 fertilized eggs 59 oocytes 59 mouse embryos 59 unused embryos 59 blastocysts 58 fertilized embryos 57 human embryos 57 blastocyst 56 leftover embryos 56 cloned embryo 56 Embryonic Stem Cell 56 Embryonic 55 gametes 55 SCNT 54 Stem Cells 54 Fetuses 54 stem cells 54 chimeras 53 Cloning 53 frozen embryos 53 Cells 53 germ cells 53 Prions 53 Adult stem cells 53 Sperm 53 vitro fertilization clinics 52 Cloned 52 unfertilized egg 52 Ovarian 52 Stem cells 52 Cancer Cells 52 sperms 52 Human Tissue 51 Human Embryonic Stem 51 Tumours 51 Organs 51 somatic cells 50 Microorganisms 50 sperm 50 genetic defects 50 iPSCs 50 pluripotent stem cells 50 Embryonic stem cell 50 fertility clinics 50 oocyte 49 wombs 49 fertilized egg 49 ovarian tissue 49 somatic cell nuclear 49 adult stem cells 49 fetal tissue 49 Organisms 48 ovaries 48 ovary 48 ES cells 48 Abnormalities 48 Transgenic 48 Stem Cell Research 48 donor sperm 48 transgenic animals 48 zygote 48 Pregnancies 48 embryonic cells 48 Kidneys 48 Lesions 48 Tumors 48 spermatozoa 48 embryonic stem cells 47 Embryonic stem cells 47 chromosomal abnormalities 47 ESCs 47 Genetic Testing 47 bone marrow stem cells 47 Implantation 47 Mitochondria 47 Pathogen 47 Genetically modified 47 follicles 46 fetuses 46 hESCs 46 Cord blood 46 therapeutic cloning 46 Zebrafish 46 MicroRNA 46 Genetically Modified 46 transgene 46 aneuploidy 46 mammary glands 46 IVF 46 Breast Cancer Risk 46 Stem Cell 45 frozen embryo 45 Fetus 45 Chemically 45 pre implantation genetic 45 Parasites 45 diploid