Related by context. Frequent words. (Click for all words.) 59 embryos 57 fertilized eggs 57 fertilized embryos 54 ovarian tissue 54 sperm 54 donor sperm 53 sperms 53 frozen embryos 53 ovaries 53 artificially inseminated 53 Embryos 52 embryo 52 oocytes 52 gametes 51 frozen embryo 51 mouse embryos 50 fertilized egg 50 ovary 50 inseminated 50 embryos implanted 49 infertile 49 vitro fertilization 49 IVF 49 bone marrow stem cells 49 ovulate 49 genetically identical 48 wombs 48 fertility treatments 48 ovaries removed 48 fertilized 48 ovum 48 blastocysts 48 cloned embryos 48 eggs 47 babies 47 follicles 47 identical twins 47 uterus 46 stem cells 46 amniotic fluid 46 tissue 45 vitro fertilization IVF 45 fallopian tube 45 human embryos 45 infertile couples 45 offspring 45 chromosomal abnormalities 45 fetal tissue 45 fertility clinics 45 X chromosomes 45 germ cells 45 newborn infants 45 infertility treatments 44 genetically 44 umbilical cords 44 oocyte 44 hermaphrodites 44 amniocentesis 44 ova 44 womb 44 triplets 44 artificial insemination 44 placentas 44 bone marrow transplants 44 organs 43 corneas 43 sperm donors 43 insemination 43 zebra fish 43 transfusions 43 ovulation 43 vitro 43 quadruplets 43 livers 43 stem cell transplants 43 miscarried 43 transplanted kidney 43 blastocyst 43 serum samples 43 retinal cells 43 islet cells 43 umbilical cord blood 43 fraternal twins 43 cultured cells 43 twins 43 semen 43 kidneys 43 assisted reproduction 43 reproductive organs 43 tissues 42 pregnancies 42 defective gene 42 terminate pregnancy 42 chimeras 42 transgenic mice 42 zygote 42 testes 42 bone marrow 42 mammary glands 42 transplants 42 ovulating