IN 1963 Gibbons discovered a novel protein on microtubules. In 1965 he purified two regions of the protein, known as its two "arms" and named the protein dynein. This protein converts the chemical energy stored in ATP to mechanical work, and is responsible for transporting any cell particle or element that needs to be moved from point A to point B. This paper includes very high resolution electron photomicrographs of dynein.

(Thanks to Juan Weiss for this reference and its interpretation.)