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Figure 2.
Fig. 2. Chemical structures for oxidized menaquinone-8
(MQ-8) (A), reduced menaquinol-8 (B), HQNO (C), and DNP-19 (D).
MQ-8 is the primary menaquinone found in E. coli membranes, but
smaller proportions of MQ-6, MQ-7, and MQ-9 are additionally
present in the organism (59).
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