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| PR:000040453 | NEDD8-activating enzyme E1 regulatory subunit isoform 1 | | |  | | |
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| PR:Q13564-1 | NEDD8-activating enzyme E1 regulatory subunit isoform 1 (human) | | |  | | |
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| PR:Q8VBW6-1 | NEDD8-activating enzyme E1 regulatory subunit isoform 1 (mouse) | | |  | | |
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| PR:Q9Z1A5-1 | NEDD8-activating enzyme E1 regulatory subunit isoform 1 (rat) | | |  | | |