J Mol Biol. 2005 Nov 25;354(2):212-9. Epub 2005 Oct 3 doi:10.1016/j.jmb.2005.09.051

Sepp A, Choo Y.

Cell-free selection of zinc finger DNA-binding proteins using in vitro compartmentalization.

With their Kd of 3pM, zinc finger protein fusions could be used instead of streptavitin or M.HaeIII to bind the DNA molecule in which they are encoded.