HPV Surface (IMAGE) Penn State Caption This shows C shows the surface rendered 3-D map of HPV16 and D shows the 3-D map of HPV16 heparin complex. Color bar indicates distance of area from the center of the particle. Credit Susan Hafenstein, Penn State Usage Restrictions Non commercial use only 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.