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ATP synthase, F1 epsilon subunit (delta in mitochondria) This model describes one of the five types of subunits in the F1 part of F1/F0 ATP synthases. Members of this family are designated epsilon in bacterial and chloroplast systems but designated delta in mitochondria, where the counterpart of the bacterial delta subunit is designated OSCP. In a few cases (Propionigenium modestum, Acetobacterium woodii) scoring above the trusted cutoff and designated here as exceptions, Na+ replaces H+ for translocation. [Energy metabolism, ATP-proton motive force interconversion]
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