Zhang Lab's CRISPR Frequently Asked Questions
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Collection
...use double nickase, you could express two spacers and use PX335 to express the Cas9n (nickase). The concept...oligo when cloning my target spacers into the PX330 vector backbone? There is no need to add the NGG PAM...start site to have high expression, so adding this G could help with expression, though it is possible ...you need to have four spacers co-expressed and using PX335 to express the Cas9n (nickase). Homologous ...co-deliver into the cells with the Cas9/sgRNAs vector (like PX330). For large changes (>100bp insertions or...the second design (in pX330 / PX335 ), so we recommend people all use the pX330/PX335 system ....concept of the double nickase system is that you can express two different chimeric gRNAs with the Cas9 nickase...