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| PR:000016983 | (E3-independent) E2 ubiquitin-conjugating enzyme | | |  | | |
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| PR:Q9C0C9 | (E3-independent) E2 ubiquitin-conjugating enzyme (human) | | |  | | |
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| PR:000068337 | (E3-independent) E2 ubiquitin-conjugating enzyme methylated 1 (human) | | |  | | |
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| PR:000084619 | (E3-independent) E2 ubiquitin-conjugating enzyme phosphorylated 1 (human) | | |  | | |
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| PR:Q6ZPJ3 | (E3-independent) E2 ubiquitin-conjugating enzyme UBE2O (mouse) | | |  | | |
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| PR:Q9ZVX1 | probable ubiquitin-conjugating enzyme E2 23 (Arabidopsis thaliana) | | |  | | |