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Impact of deletion of multiple c-type cytochromes on reduction of AQDS (left panels) and the Elliott soil humic acid standard (right panels). The strains evaluated were deficient in the genes for (a) OmcB and OmcS; (b) OmcB, OmcE, OmcS, and OmcT; or (c) OmcB, OmcE, OmcS, OmcT, and OmcZ. The data are the means ± standard errors for triplicate incubations.
