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| PR:P52478 | ubiquitin-conjugating enzyme E2 1 (worm) | | |  | | |
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| PR:Q553F3 | ubiquitin-conjugating enzyme E2 2 (Dictyostelium discoideum) | | |  | | |
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| PR:P23566 | ubiquitin-conjugating enzyme E2 2 (Schizosaccharomyces pombe 972h-) | | |  | | |
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| PR:P63146 | ubiquitin-conjugating enzyme E2 B (human) | | |  | | |
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| PR:000073780 | ubiquitin-conjugating enzyme E2 B deaminated 1 (human) | | |  | | |
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| PR:000075674 | ubiquitin-conjugating enzyme E2 B deaminated 2 (human) | | |  | | |
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| PR:000079733 | ubiquitin-conjugating enzyme E2 B deaminated 3 (human) | | |  | | |
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| PR:P63146-1 | ubiquitin-conjugating enzyme E2 B isoform 1 (human) | | |  | | |
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| PR:P63147 | ubiquitin-conjugating enzyme E2 B (mouse) | | |  | | |
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| PR:P63147-1 | ubiquitin-conjugating enzyme E2 B isoform 1 (mouse) | | |  | | |
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| PR:P63149 | ubiquitin-conjugating enzyme E2 B (rat) | | |  | | |
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| PR:P63149-1 | ubiquitin-conjugating enzyme E2 B isoform 1 (rat) | | |  | | |
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| PR:P63146-1 | ubiquitin-conjugating enzyme E2 B isoform 1 (human) | | |  | | |
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| PR:P63147-1 | ubiquitin-conjugating enzyme E2 B isoform 1 (mouse) | | |  | | |
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| PR:P63149-1 | ubiquitin-conjugating enzyme E2 B isoform 1 (rat) | | |  | | |