Microneedle Prototype (IMAGE) DOE/Sandia National Laboratories Caption Sandia National Laboratories materials scientist Ronen Polsky positions a prototype 3-D-printed microneedle holder on the arm of Sandia science writer Mollie Rappe. Rappe participated in a clinical trial to see the best length of needle to extract the interstitial fluid on the path to track the physiological condition of soldiers. Credit Photo by Randy Montoya 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.