Do Our Mitochondria Run at 50 degrees C? (IMAGE) PLOS Caption Left: Mitochondria of human cells illuminated by the thermo-sensitive probe. Four human cells, each with its nucleus (N) and its numerous hot filamentous mitochondria (yellow-red). Right: Mitochondria as radiators. A high-magnification rendering of one such filament reveals parallel arrays of closely juxtaposed membranes that could heat the mitochondrial interior. Credit Left: Malgorzata Rak; Right: Terrence G. Frey Usage Restrictions CC-BY License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.