Centromere Histone Complex (IMAGE) University of Pennsylvania School of Medicine Caption Structure of the centromere histone complex containing two chains of CENP-A (red) and two copies of its close binding partner, histone H4 (blue). Credit Ben E. Black, University of Pennsylvania School of Medicine 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.