Figure 3 (IMAGE) Institute for Basic Science Caption (A) Audible sound and enzyme-mediated spatiotemporal control of gold nanoparticle assembly. Colored concentric patterns and TEM images were taken from each region of the pattern. (B) Nanoparticle patterned hydrogel (left) and its utilization for selective cell growth (right). In the fluorescent microscope image, red spots represent HeLa cells on the patterned hydrogel surface. Credit Institute for Basic Science Usage Restrictions Attribution Required 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.