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| PR:000000066 | TGF-beta receptor-regulated SMAD family member protein | | |  | | |
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| PR:000036556 | SMAD family member 2 isoform Short acetylated and phosphorylated 1 (human) | | |  | | |
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| PR:000025938 | SMAD family member 2 isoform Short phosphorylated 1 (human) | | |  | | |
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| PR:000045494 | SMAD family member 2 isoform Short unphosphorylated 1 (human) | | |  | | |
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| PR:000025943 | SMAD family member 2 isoform Short phosphorylated 1 (mouse) | | |  | | |
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| PR:000000575 | SMAD family member 2 isoform Short acetylated and phosphorylated form | | |  | | |
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| PR:000000655 | SMAD family member 2 isoform Short acetylated and phosphorylated 1 | | |  | | |
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| PR:000036556 | SMAD family member 2 isoform Short acetylated and phosphorylated 1 (human) | | |  | | |
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| PR:000000576 | SMAD family member 2 isoform Short phosphorylated form | | |  | | |
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| PR:000000575 | SMAD family member 2 isoform Short acetylated and phosphorylated form | | |  | | |
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| PR:000000655 | SMAD family member 2 isoform Short acetylated and phosphorylated 1 | | |  | | |
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| PR:000036556 | SMAD family member 2 isoform Short acetylated and phosphorylated 1 (human) | | |  | | |
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| PR:000000656 | SMAD family member 2 isoform Short phosphorylated 1 | | |  | | |
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| PR:000025938 | SMAD family member 2 isoform Short phosphorylated 1 (human) | | |  | | |
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| PR:000025943 | SMAD family member 2 isoform Short phosphorylated 1 (mouse) | | |  | | |
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| PR:000002571 | SMAD family member 2 isoform Short unmodified form | | |  | | |