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| PR:Q5VVX9 | ubiquitin-conjugating enzyme E2 U (human) | | |  | | |
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| PR:Q5VVX9-1 | ubiquitin-conjugating enzyme E2 U isoform h1 (human) | | |  | | |
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| PR:Q5VVX9-2 | ubiquitin-conjugating enzyme E2 U isoform h2 (human) | | |  | | |
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    |
| PR:Q5VVX9 | ubiquitin-conjugating enzyme E2 U (human) | | |  | | |
 |  |  |  |  |  |
    |
| PR:Q5VVX9-1 | ubiquitin-conjugating enzyme E2 U isoform h1 (human) | | |  | | |
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    |
| PR:Q5VVX9-2 | ubiquitin-conjugating enzyme E2 U isoform h2 (human) | | |  | | |