KINESIN 1 (IMAGE) Rice University Caption Researchers simulated the mechanism that allows propofol, a common anesthetic, to halt the movement of kinesin proteins that deliver cargoes in cells. When propofol attaches to the leading head, it weakens strain on the two-headed protein that prompts a step forward. The disruption allows ATP to bind to both heads, releasing them from the microtubule pathway. RMSD stands for root-mean-square deviation, a measure of the average distance between atoms in the simulation. Credit Mandira Dutta/Indian Association for the Cultivation of Science 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.