The AzoF-RS was provided by CU Boulder and deposited in the Registry of Standard Biological Parts as BBa_X. They got it from the Schultz lab, which performed a selection experiment on the M. jannaschii TyrRS to evolve a new aaRS capable of incorporating the photoisomerizable phenylalanine-4‘-azobenzene (AzoF). Figure 1 shows a sequence alignment of the protein sequences of the M. jannaschii TyrRS and the AzoF-RS after the selection process.
