Related by context. Frequent words. (Click for all words.) 66 zygotes 62 IVF embryos 62 embryo 60 embryos 60 cryopreserved 59 gamete 58 implantation 58 fertilized eggs 57 embryo implantation 57 fetal stem cells 57 oocyte 57 undifferentiated cells 57 ovarian stimulation 57 Embryos 57 ovulated 56 preimplantation genetic diagnosis 55 fetal tissue 55 follicle stimulating hormone 55 stem cells harvested 55 unused embryos 55 somatic cell 55 fertilized embryos 55 uteruses 54 zygote 54 unfertilized eggs 54 myoblasts 54 tubal 54 spermatozoa 54 stem cells 54 blastocyst 54 neonate 53 female reproductive tract 53 transplanted tissue 53 cloned embryo 53 unfertilized 53 gametes 53 Embryo 53 fertilized egg 53 oocytes 53 granulocytes 52 umbilical cord stem cells 52 hES cells 52 vitro fertilization clinics 52 neural cells 52 gonadotropin 52 germ cells 52 intrauterine insemination 52 implant 52 embryo transfers 52 blastocysts 52 somatic cells 51 fluorescent markers 51 mouse embryos 51 unfertilized egg 51 Fallopian tubes 51 leftover embryos 51 sperms 51 ectopic 51 transplanted stem cells 51 implantations 51 ovaries 51 Fetuses 51 nematode worms 51 pancreases 51 pluripotent cells 51 ESCs 51 oviduct 50 ovum 50 epididymis 50 Artificial insemination 50 blastocyst stage 50 sperm 50 vitro fertilization treatments 50 newborn infants 50 Vitro Fertilization 50 fibroblast cells 50 Implantation 50 implants 50 tissue 50 cystectomy 50 chorionic villus sampling 50 cells hESCs 49 tissue grafts 49 spermatogenesis 49 uterine wall 49 vaginal secretions 49 endometrial ablation 49 transplanted kidneys 49 ovary 49 allografts 49 implanted 49 follicles 49 frozen embryos 49 uterine contractions 49 germline 49 cloning embryos 49 bone marrow stem cell 49 stromal 49 unexplained infertility 49 donor insemination 49 diseased tissues