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| PR:000000066 | TGF-beta receptor-regulated SMAD family member protein | | |  | | |
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| PR:000002570 | SMAD family member 2 isoform Long unmodified form | | |  | | |
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| PR:000002571 | SMAD family member 2 isoform Short unmodified form | | |  | | |
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| PR:000002570 | SMAD family member 2 isoform Long unmodified form | | |  | | |
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| PR:000002571 | SMAD family member 2 isoform Short unmodified form | | |  | | |