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| PR:P24244 | putative cytochrome bd-II ubiquinol oxidase subunit AppX (Escherichia coli K-12) | | |  | | |
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| PR:000035117 | putative cytochrome bd-II ubiquinol oxidase subunit AppX | | |  | | |
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| PR:P24244 | putative cytochrome bd-II ubiquinol oxidase subunit AppX (Escherichia coli K-12) | | |  | | |