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| PR:P51965 | ubiquitin-conjugating enzyme E2 E1 (human) | | |  | | |
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| PR:000076261 | ubiquitin-conjugating enzyme E2 E1 cysteinylated 1 (human) | | |  | | |
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| PR:P51965-1 | ubiquitin-conjugating enzyme E2 E1 isoform 1 (human) | | |  | | |
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| PR:P51965-2 | ubiquitin-conjugating enzyme E2 E1 isoform h2 (human) | | |  | | |
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| PR:P51965-3 | ubiquitin-conjugating enzyme E2 E1 isoform h3 (human) | | |  | | |
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| PR:000080120 | ubiquitin-conjugating enzyme E2 E1 methylated 1 (human) | | |  | | |
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| PR:000040911 | ubiquitin-conjugating enzyme E2 E1, initiator methionine removed form (human) | | |  | | |
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| PR:P52482 | ubiquitin-conjugating enzyme E2 E1 (mouse) | | |  | | |
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| PR:P52482-1 | ubiquitin-conjugating enzyme E2 E1 isoform 1 (mouse) | | |  | | |
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| PR:P51965-1 | ubiquitin-conjugating enzyme E2 E1 isoform 1 (human) | | |  | | |
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| PR:P52482-1 | ubiquitin-conjugating enzyme E2 E1 isoform 1 (mouse) | | |  | | |