Is this a primary or review article Highly specific epigenom

Highly specific epigenome editing by CRISPR- Cas9 repressors for silencing of distal regulatory elements Pratiksha I Thakore, Anthony M D\'Ippolito, Lingyun Song, Alexias Safi, Nishkala K Shivakumar, Ami M Kabadi, Timothy E Reddy, Gregory E Crawford & Charles A Gersbach

Solution

The article by Thakore et al. (2015) deals with a new technique called CRISPR for epigenome editing. It is a primary article.