How do I choose between the various Edit-R Lentiviral Cas9 promoter options?

Choose the promoter option that has been demonstrated, either by your own experimental observations or through references in the published literature, to actively express a transgene in your cells of choice. For optimal experimental confidence or if such information is not available, consider using multiple lentiviral promoter-Cas9 constructs or selecting the best promoter empirically using the Dharmacon SMARTchoice Promoter Selection Plate Cat #SP-001000-01 (http://dharmacon.horizondiscovery.com/rnai/shrna/smartchoice-shrna-promoter-selection-plate/).