Kinesin Motors (IMAGE) Rice University Caption Rice University researchers tethered pairs of kinesin motor proteins to plastic beads and measured their pulling power. They found the two-legged proteins, which are relatively fast and efficient on their own, had trouble keeping up with one another when they were connected. Credit Kenneth Jamison/Rice University Usage Restrictions Must credit: 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.