The Julicher and Prost (1995) model of cooperative motion of molecular motors is discussed. Some inaccuracies in original reasoning are corrected. Explicit analytical solution of model's equations is derived. Previously unexplored type of cooperative motion (reverse motion in asymmetric potential in absence of external force) is described.© (2010) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.