The CRISPR-Cas9 system is frequently used to create small deletions in the genomes of mammalian cells, but the isolation of precisely targeted mutants is still challenging. A new, two-step 'pop in & out' targeting approach facilitates this task.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4640370PMC
http://dx.doi.org/10.1186/s13059-015-0810-2DOI Listing

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