Ovariole (IMAGE) Carnegie Institution for Science Caption Insect ovaries are composed of tubes, called ovarioles, one of which is shown here. It is stained with a mitochondrial membrane-potential stain. The more red/white the color is, the higher the mitochondrial membrane potential, and in turn the higher mitochondrial activity it represents. You could think of this as a heat scale with the white/red colors being the most active and the blue/black colors having the lowest activity. Image is provided courtesy of Matthew Sieber. 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.