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Imaging Intracellular Fluorescent Proteins at Nanometer Resolution
Eric Betzig,1,2*George H. Patterson,3Rachid Sougrat,3O. Wolf Lindwasser,3Scott Olenych,4Juan S. Bonifacino,3Michael W. Davidson,4Jennifer Lippincott-Schwartz,3Harald F. Hess5*
We introduce a method for optically imaging intracellular proteinsat nanometer spatial resolution. Numerous sparse subsets ofphotoactivatable fluorescent protein molecules were activated,localized (to 2 to 25 nanometers), and then bleached. The aggregateposition information from all subsets was then assembled intoa superresolution image. We used this methodtermed photoactivatedlocalization microscopyto image specific target proteinsin thin sections of lysosomes and mitochondria; in fixed wholecells, we imaged vinculin at focal adhesions, actin within alamellipodium, and the distribution of the retroviral proteinGag at the plasma membrane.
1 Howard Hughes Medical Institute, Janelia Farm Research Campus, Ashburn, VA 20147, USA. 2 New Millennium Research, LLC, Okemos, MI 48864, USA. 3 Cell Biology and Metabolism Branch, National Institute of Child Health and Human Development (NICHD), Bethesda, MD 20892, USA. 4 National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA. 5 NuQuest Research, LLC, La Jolla, CA 92037, USA.
* These authors contributed equally to this work.
To whom correspondence should be addressed. E-mail: betzige{at}janelia.hhmi.org.
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