Related by context. Frequent words. (Click for all words.) 67 Sperm 58 semen 58 ovaries 57 embryos 56 embryo 56 ovary 56 testes 54 IVF 54 fertilized eggs 51 infertile 51 breast milk 51 follicles 51 ovulation 50 fertility 50 stem cells 50 hormone 50 sperm donor 50 amniotic fluid 49 umbilical cord blood 48 offspring 48 fertilized egg 48 tissue 47 livers 47 eggs 47 artificial insemination 46 uterus 46 kidneys 46 testosterone 46 hormones 46 fertility clinics 46 adipose tissue 46 cord blood 45 ovarian 45 vitro fertilization 45 X chromosome 45 tissue samples 45 bone marrow 44 breast tissue 44 reproductive 44 hair follicles 44 infertility 44 fertility treatments 44 stress hormones 44 Y chromosome 44 organs 44 chromosomes 44 genetically 44 egg 44 womb 44 fetus 43 frozen embryos 43 placenta 43 tissues 43 mitochondria 43 gene 43 progesterone 43 liver 42 chromosomal 42 spinal fluid 42 embryonic cells 42 Fertility 42 gland 42 genes 42 human embryos 42 platelets 41 cells 41 penises 41 fetuses 41 foreskin 41 cerebrospinal fluid 41 immune cells 41 estrogen 41 cortisol 41 vitro 41 estradiol 41 fertility clinic 41 ejaculation 41 testicles 41 antibodies 41 wombs 41 vasectomy 40 lymphocytes 40 transfusion 40 urine 40 prostate gland 40 kidney 40 saliva 40 stem cell 40 pancreas 40 zebrafish 40 genetic mutations 40 nitric oxide 40 muscle tissue 40 transfusions 40 fertilization 40 melanin 40 penis 40 conceiving 40 progenitor cells 40 blood 40 menstrual cycle