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| PR:000000066 | TGF-beta receptor-regulated SMAD family member protein | | |  | | |
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| PR:000026718 | SMAD family member 2 isoform Long, initiator methionine removed form | | |  | | |
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| PR:000018296 | SMAD family member 2, initiator methionine removed form | | |  | | |
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| PR:000026718 | SMAD family member 2 isoform Long, initiator methionine removed form | | |  | | |