You are studying a case of mRNA editing in a yeast gene in which a U is changed to a C such that a UAA stop codon is changed to a CAA glutamine codon. You hypothesize that a stretch of 30 nucleotides surrounding the UAA is sufficient for the editing to take place. How could you test this hypothesis? If your hypothesis turns out to be true, how could you then design an efficient genetic screen to identify genes that encode proteins that are required for the editing to take place?