Example image of eyePlorer eyePlorer map for 'Freemartin': Infertility Mammal Ovary Virilization Hormone In utero Intersexuality Sterilization (surgical procedure) Twin Bovinae John Hunter (surgeon) Chorion Uterus Frank Rattray Lillie Science (journal) Bede Folklore Castration Vagina Domestic sheep Goat Pig Immunology Stem cell Y chromosome Hematopoietic stem cell Organ transplant Aldous Huxley Brave New World Beyond This Horizon Robert A. Heinlein Trans man Transgender Bazil Broketail Christopher Rowley Farnham's Freehold Domestic sheep reproduction Heteronormativity The World State Cattle Animal sexual behaviour