Two Spheres Showing Loosely Bound Quarks (IMAGE) U.S. National Science Foundation Caption Now that NSF-funded researchers have discovered the long-sought pentaquark, their next step is to study how quarks are bound together within this remarkable particle. They could be bound together loosely, as sort of "meson-baryon molecule," as seen in this image. Credit CERN 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.