Figure 240

The molecular motor proteins associated with microtubules. Microtubules serve as guides for molecular motor proteins. These ATP-driven microtubule-associated motor proteins are attached to moving structures (such as organelles) and ratchet them along a tubular track. Two types of molecular motors have been identified: dyneins that move along microtubules toward their minus (-) end (i.e., toward the center of the cell) and kinesins that move toward their plus (+) end (i.e., toward the cell periphery).

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