Kinesin walks along microtubule filaments, hauling cargo from the center of the cell to its periphery. The molecular motor powers such processes as mitosis, meiosis, and transport down nerve cell axons. It has two globular heads that attach to microtubule tracks, and a flexible tail that extends outward to carry cargo. The heads break down ATP to convert energy into work. For each ATP consumed, the motor protein takes a step forward.