Effect of CoM on epoxyethane metabolism in JS60 cell extracts. ○, ethene-grown cell extract with CoM; □, VC-grown cell extract with CoM; ⋄, acetate-grown cell extract with CoM; ▿, ethene-grown cell extract with no cofactor; Δ, VC-grown cell extract with no cofactor. Data are the averages of three independent experiments, and error bars are the standard deviations.