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| PR:P51965 | ubiquitin-conjugating enzyme E2 E1 (human) | | |  | | |
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| PR:000040911 | ubiquitin-conjugating enzyme E2 E1, initiator methionine removed form (human) | | |  | | |
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 |  |  |  |  |
    |
| PR:P51965 | ubiquitin-conjugating enzyme E2 E1 (human) | | |  | | |
 |  |  |  |  |  |
    |
| PR:000040911 | ubiquitin-conjugating enzyme E2 E1, initiator methionine removed form (human) | | |  | | |