tag:techtv.mit.edu,:Array/184747120 2008-11-25 13:13:47 -0500 MIT News Office In this video, a bead has been loaded with a single kinesin molecule. When the bead comes in contact with a microtubule polymer (the thin rod), the kinesin motor runs unidirectionally on the microtubule polymer at a velocity of 600 - 1000 nm/sec. 4