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Composition of the respiratory chain of H. halophilus. The chain contains a noncoupled NDH-2 and complexes II and III converted by the menaquinone pool. Electrons are delivered to different oxidases. The two major oxidases, cytochrome aa3 (qoxABCD) and cytochrome caa3 (ctaA to -G), are highlighted. For the roles of the different oxidases, see the text.
