Glassfrogs achieve transparency by packing red blood cells into mirror-coated liver

New research shows that glassfrogs — known for their highly transparent undersides and muscles — perform their ‘disappearing acts’ by stowing away nearly all of their red blood cells into their uniquely reflective livers. The work could lead to new avenues of research tied to blood clots, which the frogs somehow avoid while packing and unpacking about 90 percent of their red blood cells into their livers on a daily basis.

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