An SEM Cross-Section of the Injectable Sponge (image) Harvard John A. Paulson School of Engineering and Applied Sciences Share Print E-Mail Caption An SEM cross-section of the injectable sponge, showing pore shape and structure. Scale bar, 200 nanometers. Credit Harvard University Usage Restrictions with credit Share Print E-Mail 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.