Readers should cite both the Bio-protocol preprint and the original research article where this protocol was used:

Forsberg, K(2020). AcrIIA11 homolog discovery and phylogenetic placement. Bio-protocol Preprint. bio-protocol.org/prep321.
Forsberg, K. J., Bhatt, I. V., Schmidtke, D. T., Javanmardi, K., Dillard, K. E., Stoddard, B. L., Finkelstein, I. J., Kaiser, B. K. and Malik, H. S.(2019). Functional metagenomics-guided discovery of potent Cas9 inhibitors in the human microbiome. eLIFE. DOI: 10.7554/eLife.46540