Fig. (4) Effect of dihydrodiconiferyl alcohol (1) and lariciresinol (2) dissolved in DMSO on the activities of carbon and nitrogen metabolism enzymes in lettuce leaves after 14 days of MS medium culture, supplemented with (▧ )or without sucrose (▇). Lignans were added from the day 4 of MS culture. Controls, with and without sucrose, were treated only with DMSO. The values are mean ± SD (n=4).