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| PR:Q9FF66 | ubiquitin-conjugating enzyme E2 22 (Arabidopsis thaliana) | | |  | | |
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| PR:Q54I43 | ubiquitin-conjugating enzyme E2 S (Dictyostelium discoideum) | | |  | | |
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| PR:Q9VX25 | ubiquitin-conjugating enzyme E2 S (fruit fly) | | |  | | |
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| PR:Q16763 | ubiquitin-conjugating enzyme E2 S (human) | | |  | | |
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| PR:Q921J4 | ubiquitin-conjugating enzyme E2 S (mouse) | | |  | | |
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| PR:B5DFI8 | ubiquitin-conjugating enzyme E2 S (rat) | | |  | | |
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| PR:Q4V908 | ubiquitin-conjugating enzyme E2 S (zebrafish) | | |  | | |