Related by context. Frequent words. (Click for all words.) 53 embryos 53 sperm 52 fertilized eggs 49 embryo 46 ovary 45 fertility clinics 45 vitro fertilization 45 IVF 45 eggs 44 artificial insemination 44 vitro fertilization IVF 44 wombs 44 fertility treatments 43 umbilical cord blood 42 infertile couples 41 frozen embryos 41 egg 41 surrogacy 41 organs 40 stem cells 40 human embryos 40 fertilization 40 ovaries 40 livers 40 infertile 40 semen 40 stem cell 39 heifers 39 fertility clinic 39 calves 39 Sperm 39 therapeutic cloning 39 surrogate mother 38 fertility 38 amniotic fluid 38 HFEA 38 roe 38 fertilized egg 38 cord blood 38 cloning 37 sperm donor 37 offspring 37 chicks 37 Hwang 37 ovarian 37 piglets 37 infanticide 36 pregnancies 36 fertilized 36 babies 36 Fertility 36 testes 36 marrow 35 organ transplants 35 transplants 35 breast milk 35 PGD 35 follicles 35 transplantation 35 embryonic cells 35 uterus 35 reproductive 34 Human Fertilisation 34 penises 34 infertility 34 po 34 cloned 34 transfusions 34 human cloning 34 tissue 34 breeding 34 kidney 34 organ 33 blood transfusions 33 oysters 33 ewes 33 vitro 33 caesarean section 33 vaginas 33 newborn babies 33 caesarean 33 fetuses 33 suk 33 cadaver 33 progesterone 33 bone marrow transplants 33 kidneys 33 pups 33 lobsters 32 specimens 32 gynecologists 32 specimen 32 abortions 32 breeders 32 crabs 32 ultrasounds 32 corneas 32 transgenic 32 mares 32 organ transplant 32 ewe