.
The BioID paper has some detailed protocols: http://jcb.rupress.org/content/196/6/801.long
Some smaller companies supply nice magnetic streptavidin beads:
http://www.polysciences.com/Catalog/Department/Product/98/categoryid--593/productid--2575/
http://www.nanocs.net/Streptavidin-magnetic-nanoparticles-25nm-1.htm
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