Mexican tetra fish may offer heart repair clues

For this study, Dr Mathilda Mommersteeg and her team at the University of Oxford studied two types of Mexican tetra fish – river-dwellers that are able to self-heal their heart tissue, and cave-dwellers that cannot. The cave fish, who once lived in the rivers of Northern Mexico, were washed into caves by floodwaters about 1.5 million years ago and evolved, losing their sight and color because of living in perpetual darkness.



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