Two Load-Bearing Kinesins (IMAGE) Rice University Caption This is an illustration shows two load-bearing kinesins as they carry cargo along a microtubule (cyan). Rice University and University of Houston researchers determined that motor proteins respond best to strong forces and hardly at all to weak ones, even those applied by motors attached to the same cargo. In this example, the leading kinesin (LK) carries most of the load, with motor heads (blue) activated by a neck linker (yellow) that connects to the stalk (red) and senses the presence of the cargo. Credit Center for Theoretical Biological Physics/Rice University Usage Restrictions For news reporting purposes only. 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.