FIGURE 18-19 Model of kinesin-1-catalyzed vesicle transport. Kinesin-1 molecules, attached to receptors on the vesicle surface, transport the vesicles from the (−) end to the (+) end of a stationary microtubule. ATP is required for movement. See R. D. Vale et al., 1985, Cell 40:559, and T. Schroer et al., 1988, J. Cell Biol. 107:1785.