Confocal Microscopy (IMAGE) Wiley Caption This is a confocal microscopy showing myonuclei (blue) in an individual muscle fiber (red). Credit The Physiological Society, 2013 Usage Restrictions None 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.