Motors (1 of 2) (image) Rice University Caption Scientists at Rice University regulated the size of vesicular organelles called peroxisomes and the density of protein motors on their surfaces to analyze how the motors cooperate as they move the vesicles inside cells. The PEX 3/FKBP receptors, when incubated with rapalog, allow transiently expressed kinesin and myosinVa motors to be coupled to vesicle surfaces via FRB protein fusions. Once coupled to the vesicles, the motors pull them along cytoskeleton filaments (bottom). Credit Diehl Lab/Rice University Usage Restrictions None 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.