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Asian elephant "Big" running through race in Thailand; still frame from video by John R. Hutchinson.

Kinesin (a motor protein) pulling a vesicle along cytoskeletal filament - "kinesin is a protein belonging to a class of motor proteins found in eukaryotic cells. Kinesins move along microtubule (MT) filaments, and are powered by the hydrolysis of adenosine triphosphate (ATP) (thus kinesins are ATPases)."