Sulfur Respiration in Mammals (IMAGE) Tohoku University Caption This is a diagram of sulfur respiration: oxygen-independent energy production system in mammals. Credit Takaaki Akaike Usage Restrictions Copyright: Takaaki Akaike 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.