Dark Sea Sex and new medical discoveries

The two fish in mating, fuse parts of their flesh and bone but do so seamlessly without a tragic autoimmune response. In humans, organ transplants usually fail due to an over reactive autoimmune response of a foreign invader, causing the new organ to fail. These fishes perhaps do not have a working autoimmune response for parasitic sex at all but perhaps for other species. Studying said fish may lead to medical breakthroughs in immunology and pathways that may be modulated for more successful transplants in the future. It is a marvel how studying the most outlandish symbiotic relationships lead to more utilitarian discoveries in medicine.