Ethene (•) biodegradation and epoxyethane (▴) accumulation in (A) ethene-grown, wild-type JS623 cultures, (B) ethene-grown, VC-adapted JS623-E, and (C) ethene-grown, VC-adapted JS623-T. The data points are the averages from analysis of three replicate bottles, and the error bars are the standard deviations. In some cases, the error bars are smaller than the symbols. The behavior of these cultures was confirmed in at least two independent experiments.