  We demonstrate that endonuclease deficient Clustered Regularly Interspaced
Short Palindromic Repeats CRISPR-associated Cas9 protein (dCas9) fused to the
photo-convertible fluorescence protein monomeric mEos3.1 (dCas9-mEos3) can be
used to resolve sub-diffraction limited features of repetitive gene elements,
thus providing a new route to investigate high-order chromatin organization at
these sites.
