The hypothetical mechanism of veratrate demethylation to vanillate by Rhodococcus erythropolis cells, dependent on activated state of formaldehyde (Malarczyk and Pazdzioch-Czochra, 2000) . Reproduced with permission of the Biochemical Society. Modified. Abbreviations: HCHO and H*CHO-formaldehyde in normal and activated state; 4-O-D-4-O-Demethylase system, Ox.NADH-NADH oxidase system, MAX state-maximal oxygen uptake, MIN state-maximal oxygen release. More details in the text of the original paper.