Tryptophan Operon: mRNA 4 trpD→ regions 1, 2: synthesis of leader peptide regions 2, 3: form stem-loop structure regions 3, 4: form stem-loop structureTryptophan Operon: mRNA 1 2 3 4 trpE → • regions 1, 2: synthesis of leader peptide • regions 2, 3: form stem-loop structure • regions 3, 4: form stem-loop structure