Mitochondria (IMAGE) Carnegie Institution for Science Caption This is an artist's depiction of mitochondria, courtesy of Matthew Sieber. The purple on the outside border represents the outer mitochondrial membrane. The blue on the inside depicts the mitochondrial inner membrane space. The green and purple inside depicts the inner mitochondrial membrane and mitochondrial matrix. Credit Matthew Sieber Usage Restrictions With credit 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.