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| PR:000027717 | ribonucleoside-diphosphate reductase class I, small subunit | | |  | | |
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| PR:000014307 | ribonucleoside-diphosphate reductase subunit M2 B | | |  | | |
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| PR:000041367 | ribonucleoside-diphosphate reductase subunit M2 B isoform 1 | | |  | | |
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| PR:Q7LG56-1 | ribonucleoside-diphosphate reductase subunit M2 B isoform 1 (human) | | |  | | |
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| PR:Q6PEE3-1 | ribonucleoside-diphosphate reductase subunit M2 B isoform 1 (mouse) | | |  | | |