Gel Electrophoresis (IMAGE) Penn State Caption Figure 2: Gel electrophoresis images of the two Penn State DNA ladders created by cutting the pPSU1 and pPSU2 plasmids with restriction enzymes. The 100-base-pair (bp) ladder is designed to be used with both agarose and acrylamide gels. Credit Penn State University Usage Restrictions The image credit must be used along with the image. 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.