Oxygen uptake in the presence of DDVA by cell extracts of SYK-6 (a), SYK-6 which was not cultured in W medium containing 0.1% DDVA and 0.1% syringate (b), the DDVA O demethylation-deficient mutant NT-1 (c), the recombinant strain NT-1/pMC15 (harboring ligX) (d), E. coli harboring ligX and ligZ plus NT-1 (e), and E. coli harboring ligX and ligZ (f). All SYK-6-derived strains were treated with octanoyl-N-methylglucamide (MEGA-8).