Microneedles (IMAGE) Optica Caption This array of microneedles was created, four needles at a time, by a four-beam two-photon polymerization system. The scale at the bottom shows a length of 1 millimeter. Credit <I>Biomedical Optics Express</I> 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.