Some species of anglerfish – the deep-sea predator that uses a luminous lure to attract prey – have a bizarre way of reproducing: they fuse with their mates. We now know how the fish can fuse tissues without triggering a potent immune response. They have a strange immune system.
There are 168 known species of anglerfish, which are found at ocean depths beneath about 300 metres. Some species mate through a process known as sexual parasitism. Males, which are often less than 10 millimetres in length, attach to the body of the larger female.
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