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| PR:Q13404 | ubiquitin-conjugating enzyme E2 variant 1 (human) | | |  | | |
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| PR:Q13404-2 | ubiquitin-conjugating enzyme E2 variant 1 isoform h2 (human) | | |  | | |
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| PR:Q13404 | ubiquitin-conjugating enzyme E2 variant 1 (human) | | |  | | |
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| PR:Q13404-2 | ubiquitin-conjugating enzyme E2 variant 1 isoform h2 (human) | | |  | | |