Optimizing delivery conditions is a critical step in any experiment utilizing the CRISPR/Cas9 system. The Invitrogen™ LentiArray™ CRISPR Positive Control Lentivirus gRNA against HPRT is a highly efficient gRNA validated in multiple human cell lines that has achieved editing efficiencies of greater than 80%. It can be used to rapidly determine ideal delivery conditions in order to achieve maximum editing efficiency in your cell model of choice.