“…Numerous computational tools are freely available to aid sgRNA design for a wide spectrum of PAM sequences, as well as for on-target efficiency and off-target cleavage predictions: Broad GPP Portal 24 , Cas-Database 25 , Cas-OFFinder 26 , CasOT 27 , CCTop 28 , COSMID 29 , CHOPCHOP 30,31 , CRISPRdirect 32 , CRISPR-DO 33 , CRISPR-ERA 34 , CRISPR-P 35 , CROP-IT 36 , DNA Striker 12 , E-CRISP 37 , flyCRISPR 38 , GUIDES 39 , GuideScan 40 , GT-scan 41 , MIT CRISPR design tool 8 , WU-CRISPR 42 , CRISPRseek 43 , sgRNAcas9 (ref. 44), and CRISPR multiTargeter 45 , as well as others offered by companies such as Deskgen 46 and Benchling 46 .…”