1 Identity and Substrate-Specificity of Reductive Dehalogenases Expressed 1 in Dehalococcoides-Containing Enrichment Cultures Maintained on Different Chlorinated 2

Identity and Substrate-Specificity of Reductive Dehalogenases Expressed 1 in Dehalococcoides-Containing Enrichment Cultures Maintained on Different Chlorinated 2 Ethenes 3 4 Xiaoming Liang, Olivia Molenda, Shuiquan Tang, Elizabeth A. Edwards 5 6 Department of Chemical Engineering and Applied Chemistry, University of Toronto, 7 Toronto, Ontario, M5S 3E5, Canada 8 9 Running Title: RDase Activity and Expression 10 11 12 13 14 15