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| PR:000000066 | TGF-beta receptor-regulated SMAD family member protein | | |  | | |
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| PR:000036554 | SMAD family member 2 isoform Long acetylated and phosphorylated 1 (human) | | |  | | |
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| PR:000025934 | SMAD family member 2 isoform Long phosphorylated 1 (human) | | |  | | |
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| PR:000025935 | SMAD family member 2 isoform Long phosphorylated 2 (human) | | |  | | |
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| PR:000025936 | SMAD family member 2 isoform Long phosphorylated 3 (human) | | |  | | |
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| PR:000025937 | SMAD family member 2 isoform Long phosphorylated 4 (human) | | |  | | |
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| PR:000045371 | SMAD family member 2 isoform Long unphosphorylated 1 (human) | | |  | | |
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| PR:000036554 | SMAD family member 2 isoform Long acetylated and phosphorylated 1 (human) | | |  | | |
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| PR:000025934 | SMAD family member 2 isoform Long phosphorylated 1 (human) | | |  | | |
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| PR:000025935 | SMAD family member 2 isoform Long phosphorylated 2 (human) | | |  | | |
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| PR:000025936 | SMAD family member 2 isoform Long phosphorylated 3 (human) | | |  | | |
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| PR:000025937 | SMAD family member 2 isoform Long phosphorylated 4 (human) | | |  | | |
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| PR:000045371 | SMAD family member 2 isoform Long unphosphorylated 1 (human) | | |  | | |
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| PR:000036554 | SMAD family member 2 isoform Long acetylated and phosphorylated 1 (human) | | |  | | |
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| PR:000025934 | SMAD family member 2 isoform Long phosphorylated 1 (human) | | |  | | |
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| PR:000025935 | SMAD family member 2 isoform Long phosphorylated 2 (human) | | |  | | |
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| PR:000025936 | SMAD family member 2 isoform Long phosphorylated 3 (human) | | |  | | |
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| PR:000025937 | SMAD family member 2 isoform Long phosphorylated 4 (human) | | |  | | |
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| PR:000045371 | SMAD family member 2 isoform Long unphosphorylated 1 (human) | | |  | | |