Walking Molecule (1 of 2) (IMAGE) University of California - Riverside Caption This image shows a quadrupedal molecular machine trotting -- diagonally opposite hooves move together. The researchers found that this form of movement distorted the molecular species far too much to be viable. Credit Bartels lab, UC Riverside. 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.