Dan Graur, University of Houston (IMAGE) University of Houston Caption Evolutionary biologist Dan Graur has published new calculations that indicate no more than 25 percent of the human genome is functional. Credit University of Houston 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.