Fig. 3

Comparison of the effects of OsCOMT and SaCOMT on melatonin production. Two E. coli strains (10 OD) were harvested after 16 h of induction at 16 °C, resuspended in 1 mL pH 7.0 Tris–HCl, and cultured with 1 mg/mL NAS and 2 mg/mL methionine at 30 °C. Data are the means ± standard deviations of triplicate experiments. The absence of error bars indicates that the error was smaller than the symbol size