Bead Chip (IMAGE) Children's Hospital of Philadelphia Caption This bead chip contains 550,000 genetic markers which are used to bind with an individual's DNA sample. Researchers then analyze the results to reveal the variations in a person's genome -- their full set of DNA. Credit The Children's Hospital of Philadelphia 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.