Transplantation in nature.
D000818:Animals; D002417:Cattle; D002822:Choriocarcinoma / Q000276:immunology; D004283:Dog Diseases / Q000276:immunology*; D004285:Dogs; D005260:Female; D005306:Fertilization; D005399:Fishes / Q000502:physiology*; D006086:Graft vs Host Disease / Q000276:immunology; D006801:Humans; D007108:Immune Tolerance; D007774:Lactation; D008228:Lymphoma, Non-Hodgkin / Q000662:veterinary; D008297:Male; D008431:Maternal-Fetal Exchange; D008545:Melanoma / Q000635:transmission; D009368:Neoplasm Transplantation; D010227:Parabiosis; D011247:Pregnancy; D014184:Transplantation, Homologous; D014327:Trophoblasts / Q000276:immunology; D014594:Uterine Neoplasms / Q000276:immunology