array-of-filled-microparticles (IMAGE) Rice University Caption An array of hollow microparticles developed in the laboratory of Rice University bioengineer Kevin McHugh for timed-release drug delivery. The particles, which are shown loaded with colored dye, are small enough to fit through a standard hypodermic needle and designed to biodegrade over time, releasing their drug payload weeks or even months after injection. Credit Credit: Tyler Graf/Rice University Usage Restrictions Must credit: Tyler Graf/Rice University License Original 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.