Video by Roshni Nelson as a part of her "Cell Membranes" Science Suitcase for STARS at UT Southwestern, Dallas. Funding by HHMI. Joel Goodman, STARS Director. See more info at utsouthwestern.edu/STARS. Next chapter: vimeo.com/31412291 .

Check out our videos on Evolution: vimeo.com/19796663 and Photosynthesis: vimeo.com/18544535 !

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