A protein that acts as a motor (it moves stuff). Motor proteins are essential to life as we know it.

Myosins are the responsible for movement along the thin filaments of actin in our cells. Specifically, The two most common kinds of Myosin are Myosin I, which moves filaments themselves and vacuoles full of things like neurotransmitters that are essential to thought, and Myosin II, which is important for the motion of muscles (see sarcomere).

Dyneins and Kinesins are motor proteins that move on microtubules and are essential to mitosis (cell reproduction), cilia, and flagella like the tail of sperm cells. These are also important for transport and cell structure.

While there are motor proteins for microfilaments and microtubules, there are no known motor proteins for intermediate filaments probably because intermediate filaments are non-polar, so the motor would have a very hard time moving in one direction consistantly.

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