The figure shows RP-HPLC tracings (panels A-E) and MALDI-TOF mass spectra (panels F-J) of α-ribotides synthesized by MjCobT under conditions described under Materials and Methods. The substrates used were: 5,6-dimethylbenzymidazole (panels B, G), adenine (panels C, H), 5-hydroxybenzimidazole (panels D, I), and 5-methoxybenzimidazole (panels (E, J).