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Science 24 April 1987:
Vol. 236. no. 4800, pp. 450 - 453
DOI: 10.1126/science.3563522
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Articles

Science, Vol 236, Issue 4800, 450-453
Copyright © 1987 by American Association for the Advancement of Science

articles

A small gold-conjugated antibody label: improved resolution for electron microscopy

JF Hainfeld

A general method has been developed to make the smallest gold-conjugated antibody label yet developed for electron microscopy. It should have wide application in domainal mapping of single molecules or in pinpointing specific molecules, sites, or sequences in supramolecular complexes. It permits electron microscopic visualization of single antigen-binding antibody fragments (Fab') by covalently linking an 11-atom gold cluster to a specific residue on each Fab' such that the antigenic specificity and capacity are preserved. The distance of the gold cluster from the antigen is a maximum of 5.0 nanometers when the undecagold-Fab' probe is used as an immunolabel.


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