This animation is popping up all over. It makes the biology of cells both fascinating and aesthetic. Harvard University has sponsored this animation of the "Inner Life of the Cell" (HiRes, LoRes), and a short version is available for viewing. The animation on YouTube is not nearly as high quality as that accessed by the link above.
The Internet-released version has a music soundtrack, but lacks any commentary soundtrack. If you want an explanation of the action click on Inner Life of the Cell.